Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e8323b88475e62…

MALICIOUS

PDF

86.3 KB Created: 2021-08-01 19:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 54f37db438e57b4354c3fb2c7b3d376e SHA-1: 80200c9b33ff9fb1c31478a14922b466aa669a03 SHA-256: 41e8323b88475e6226009eb91bc13cf44b62af245bdac1bce394a9e800208697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Several heuristics point to the use of compromised WordPress sites and disposable hosting for hosting malicious content, indicated by URLs like 'http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f3c98562---46203391454.pdf'. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f982a6720b---zexevamakipupo.pdf In PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/38151102889.pdfIn PDF document text
    • http://kco.su/userfiles/file/gimafanoxegugunosut.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bcbe84213c66f1cb498e5abce22f4098/7365201291.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4fe6484d522d8905e44b930536faa9d8/jamubifoxid.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/sajamimu.pdfIn PDF document text
    • http://dges.in/userfiles/file/1741680233.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f3c98562---46203391454.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1dmr5tg3okn3sqrb3svo8eod67/dubiv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5feebb66c7b7d9de060bf54a4376488d/budujizozexekajasusaveg.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a636db8630e---52812057109.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tukqs6oua9jho2f6duj2kuc7gn/50746122553.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/58432e103b8a6672e28e90b33dc93b30/kikebaxipijalonuvutowezik.pdfIn PDF document text
    • http://flirdining.com/uploads/files/deradomusi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bd56e8bf---mejuwegutevuzize.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e71f81bf7---gazotinug.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aad948794f2---jewozerowixubijowevaxiwew.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/49524181836.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/86349159630.pdfIn PDF document text
    • https://derfo.info/resimler/files/jejusi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607169e53d902---wupidewufop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+installation+failed+in+the+safe_os+phase+with+an+error+during+migrate_data+operationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 17540 bytes
SHA-256: 7be7e8f1baa935bf74dfdd5bbba42edb16c3da1adb518476297405d05423c7ef
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 11124 bytes
SHA-256: bc46d10e3b16d053ec41b8edc67f702e40c95aa5c2cdc482dd20909ab9dafb41
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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