Malicious PDF — malware analysis report

Static analysis result for SHA-256 205e6b423591f304…

MALICIOUS

PDF

99.3 KB Created: 2021-07-13 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1ad41d94f8fbabd24e43a54a9be3796c SHA-1: 92e8aa9c9826f00b0a25654a2cfcebd7b18ab481 SHA-256: 205e6b423591f30420d386b9d0569e78e4b276f48ed6a256c883eeef75a6fef4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading a secondary payload, likely another PDF or executable, from one of the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7994de5cc---lipop.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8e8b0cd81a96bef56e2304dba1f1fb64/27100834484.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/nefoxi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/suxobabipofibukivogoma.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/78830794500.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7065904bd4---jopewinutuxigufodule.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4704f0330e489a806bb64b98c85a3df5/wudesolelib.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/razogizuraredovag.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cba6ecece---86473864230.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/93234788467.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/71cd32bcf31222b53a4bad46127c0668/nobezaxideduniwufuwedupo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4547800f04---86193415736.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b626430918e483210c127cc00f7f330/49639392354.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/novewave.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/63395919170.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/viknm1i9k2iltbuar47f2mdl90/motebakozonukizewu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916a3ec672f---sisojimavuvisojakopu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/memoketukoduweri.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/69684720178.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d1f938009eaf6f4897ea957e97cfe805/fesosudife.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/93653615172.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9472bc38d---3925058725.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jelebibidolunavumazu.pdfIn PDF document text
    • http://billsky.ee/files/file/jewapuduzekewabuga.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nojemufirolowazarodak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sonic+mania+all+chaos+emeraldsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 10612 bytes
SHA-256: 75cb3fa0a4d7c5dd0e20b00c43224c5a9926ca378f39434fff0233ef9614ec58
font_01_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E2 17396 bytes
SHA-256: 73fae152863c1c0c3e1ad78f45b0b27934fc3f12dfb9bdcebc718ed7cfc8db68

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