Malicious PDF — malware analysis report

Static analysis result for SHA-256 44789a236d9c2a11…

MALICIOUS

PDF

109.0 KB Created: 2021-10-31 03:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd6bcad348211283c05fe5bf38815758 SHA-1: ed888b7cc579d8d2dab3c01a45fb840643f54ae3 SHA-256: 44789a236d9c2a11a6ef0ea594d5224b7104c3bce6d834ae0eed8fa3da9cf603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, consistent with a link farm used to distribute malware or conduct phishing attacks. The document body is unreadable, but the heuristics strongly indicate a malicious intent through its link structure.

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://banderlogclub.ru/Files/file/62515951342.pdf In PDF document text
    • http://packturf.fr/files/25280629918.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f01855ae---kofivezupeworit.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/44715842694.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a74191238---26197610189.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/45639152048.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/remadozefivafutaxibilop.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kegimutum.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/35725446058.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615b13b4241f3---waronu.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/xagotamiwixipunafi.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/64804966020.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1633796381.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16158abc2d7342---98213414775.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/74761406653.pdfIn PDF document text
    • http://bociany.sk/media/file/89794272629.pdfIn PDF document text
    • http://varvshistoriska.com/file/vofewav.pdfIn PDF document text
    • https://euchebnici.com/img/file/fesudoxaxopozugozilurudu.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/mawojedemufuv.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/kuded.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210907115222.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/18921389889.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ae0664f5---72668136567.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38f6c6745---litusutolokufuzibal.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=accounting+principles+answersPDF 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_off0001461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E36 10716 bytes
SHA-256: 8c8102fa455a30eef70c2c84789d537196e568f44cb95074c8513cbb0d4a262d
font_02_sfnt_off00017712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17712 18024 bytes
SHA-256: 8ee7d7704fe44932af0c740d8a40c92eb3ac270478c55ff29b0c6c75f552d80a

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