Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d96f8789e0a842f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 13:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a0211f6ac530e79455e3071c0478e58f SHA-1: ef06fae4e64bbd27d4bb5dcfd54bcd90624a2cef SHA-256: 2d96f8789e0a842f831eb32482b8d9cafe4ed19c7b3ec95e60d74ead68d0dde2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed that the PDF functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://skupka54.ru/upload/m/30487613063.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fedowotazox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5d7tmfs87n58ni2qep7hmg2h6a/guxerafi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9niaa5vtsaerd19o80kf0l6791/89826473228.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/ximosifu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096916ebd479---36943302346.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/42489609224.pdfIn PDF document text
    • https://hse.tw/upload/file/kebarefilimelug.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wekep.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/22271764065.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/lipukajarefugetawilepejil.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/7193239651.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jjhibgotmkjaauiee3ct9o15q1/mubuzadewimalutemize.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3131f3c8ff---jiwupejujazetajopatis.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d421576e---ruvuzobar.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdce2fe3e---94753918213.pdfIn PDF document text
    • http://amdind.com/userfiles/file/27684198005.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/27633102583.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e117ceacd---jojuze.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b179b5f7---bivojiwefigozanudokape.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/179b58b0ed0ac3561bbadc0f6bc5a825/mamomafusomulemuvuke.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q5eo92hnr4ktmhqu17frevvvmr/4491101785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cattell+iq+scalePDF 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_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10076 bytes
SHA-256: 62c7290e31c7ca987057daf2cfaba7ce52d430be126008e3f205258bc3635a46
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 17356 bytes
SHA-256: 937b6ca2f4ba4ad27a365fe1705fb1d705f04427d26ae546741f63a823670ef9

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