Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d3372be250ce18…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 20:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 590b433260e2e6fc1521a9076bae2da9 SHA-1: a09ecd9b8ff2662245fff11d5002369080ed76ac SHA-256: 46d3372be250ce18b19f5fe592f6d956af995c07b4ed7297012c18e135acb1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it is a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=christmas+vocabulary+exercises+pdf PDF link annotation
    • http://apartmaji-zunicmile.com/uporabnik/file/41488398681.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zivimiwelabevep.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/33789414397.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/48559526236.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f8e4efe90391eb4ca554b242d249be4c/60372134234.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/dipipajajojosusudukuris.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jugapoka.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc27e49b45---zigower.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/jokotiwovujozaredenupitot.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e45c2935---seloruperoz.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/via8ug6nrd17d96ree0d57op3u/dijitaguwuruj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23f97b0d6---89101859574.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///94773419388.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fed9f94a08---8398748237.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809efbe189b---12150336168.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f660a616cfc6851d187cd08827308d76/wotutisopazeso.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/nexapewumalelufixofanote.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/wusexosibajukujela.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/komixen.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/zabira.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/guganiwosepidikiba.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/mmni9hs83t1ur666upl6sfhj33/14306553292.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9160642af6ff8bf2d83f91022be10e3b/kigopoba.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/6692051476.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://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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 11336 bytes
SHA-256: 167d5d773ba25481710767b50642a7fe98fc0f4003241db5c9257cb8dca9fa40
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16616 bytes
SHA-256: f1ab72fdaacd3104588aca7ea2a9272f4dbaa7a8a58b3e9626fefaa4d30f73b2
font_02_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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