Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c96a4d7d4414a2…

MALICIOUS

PDF

92.3 KB Created: 2021-07-15 21:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4906406d1d08ca1ff75f83386be86668 SHA-1: 5249228c0f9a9424f428c53fbc5b6ec863188301 SHA-256: a2c96a4d7d4414a2b2b221803593e8ef0232cce8890bde20d85a74996790f1e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for issues like billing or fraud. While no scripts were extracted, the presence of multiple URLs pointing to compromised CMS uploads suggests a pattern of hosting malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e485c48f64c---puxunis.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af860bcc2b5---rawodinivaxedidomisun.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c506bc5c8b---23008205461.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/dodipidanizeme.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/813e7ca05e94e9b3c2900448bf7efcdf/fonesimemipudowewomijadix.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zalaxob.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/42296682278.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e818254fe2441cd42e9667b274919fa8/22074879743.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076229c5c553---9471860580.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/turopizijubig.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/15498625349.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ff7ad62d59930da8410e7af78c2e3f93/29772450783.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45b882a18---fivigefadoso.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kozosedijolo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4f439a3ed2f126be105687b60cf6d39d/55618632071.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8551131b---wipebeguzijatuneku.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/retitabifozajirizirom.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/38722398643.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/20062872299.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b64793fe1d7b31731e712a31bc8ab44/sugasuvebeborikigazifewe.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wajujanijowomewa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/21962173337.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160765c26bb8d0---52771661424.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec69f468---5921503033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meloxicam+and+diazepamPDF 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_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10464 bytes
SHA-256: 4149f85a5e53f982f7e1d22a78159815faf1ede18d7e119fd93d6293158898e0
font_01_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 16608 bytes
SHA-256: f7ddc434542ed9b9ddefc05bc9636adb7c5ae42e48f04216fadcd5048d055d4d
font_02_sfnt_off00014c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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