Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e904939a71f1c40…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 09:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed70173410257a59c2ccd015132e75ec SHA-1: 04fbbcdc29c5a1e1011d4b87f8ee89a53d21f0fa SHA-256: 3e904939a71f1c40edb0ddaf868378681311a4177b2f018fc871eba0c55f5a7f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm on potentially compromised or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads. The primary attack pattern involves leveraging these links for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 https://archism.ru/uplcv?utm_term=skin+minecraft+2021 PDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1ef37b91---pabutexuvesukimitidopixux.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac491fdb6---zowovu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tumogufore.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/wasaguzevofugetakazotasuv.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vanafekis.pdfIn PDF document text
    • http://artediapharma.com/upload/files/zapew.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/besixu.pdfIn PDF document text
    • http://cichanski.com/Upload/file/rejiwuduvileworad.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tuvugonamuwupudexarelaxa.pdfIn PDF document text
    • http://bociany.sk/media/file/ramititaj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e8c1feaa---gogowofatezabakuzibul.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2l6k4im3r2ihegl74qdg08t7so/91720809947.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/juvipukemoriziz.pdfIn PDF document text
    • http://ipllaser.in/uploads/47508831198.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vajopuxamo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/xetavonivesoke.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/32311348471.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/rawiw.pdfIn PDF document text
    • https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/baxakevirinema.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/52587421968.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5751b6ad1d121c7d4a23644809437420/nojuneta.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gusujab.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_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 17248 bytes
SHA-256: 8e95640d7d90011dc91cf6a21f9a84ce04312abb3a590c9e2f24f4ae0e5af71f
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10624 bytes
SHA-256: 9160c2936de136b727918c8b4533a920f6ad4d61150c34b72cdb81c724d7dc2c

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