Malicious PDF — malware analysis report

Static analysis result for SHA-256 681500374418cdb3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 21:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b81d6abadef3c880de507e7f401e583 SHA-1: d74a90a24788c98cb34e834f7506321dce63cd10 SHA-256: 681500374418cdb3eeaaf2d1330ad979a158933f1dfa39eef4c9b4b504bf842e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to serve as a lure for further malicious activity. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests it may be used to trick users into downloading password-protected archives, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=nuovo+progetto+italiano+1+quaderno+degli+esercizi+pdf+soluzioni PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46f8091b4---gilugataxufib.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a47823a373f---rutajipuwegajofamonij.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47caf0b1b---67343004389.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f1df8b8f2c1---xasumikusigabulubozut.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/pomapawogugelagorixot.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/vezusosepa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k1kb8hdfnq7768iuqj9vu5hg83/rojusaxerudixusekit.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060817484725.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e936c390810---3500558607.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670b91443e---pukafikifufu.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/20914022921.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2b372b4cd316449df95dc57492dea797/jatekezufarasavebu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fe6d3d8e---pewuwaxodepugi.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/15736783929.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d2v9hvdqa9d3sbu8423ip3777/ruwelugevawuseximojanopax.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/poxedaziriti.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/11567129215.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e27997a69---bagafawi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3341d2bb2cf1dfc6aba9f53e5c8bb3b8/bilujanolilonepi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cf32e37b51f06d54c5184aa063c31526/vexori.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n0v490oatsabcd48mhtanebdvu/93609436923.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/kodubok.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq5bhmjk89k1o1vibnk12nm425/65192435419.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44a9e4e474---jobirerimimikivenazipo.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/kenigezotabudasixud.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20e04c73b---terajigorugetugupuxadog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 19760 bytes
SHA-256: 908a5b1d68329b45d2c23e938909e58a47cb87336d30b21b9d5dcedc46dcc7cc
font_01_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 11196 bytes
SHA-256: 332382f63d4d1038e79bd51899bce101c8a552eab0d907dfbf053c5033d132a0

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