Malicious PDF — malware analysis report

Static analysis result for SHA-256 257c0a9fb64fa40c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 11:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eef548817abb83cbf92632c849b2276 SHA-1: 529b00c25d93de029215ad226578f2d672d31f14 SHA-256: 257c0a9fb64fa40cc51da8ff8c70367dca752e16b4e457ae1cd4cd5b70f9e3cc
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4489109e2c0def33ef0562c6fe9c09fd/98406261227.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d63eda68---sotowiteturuzujemaje.pdfIn PDF document text
    • http://immopolignano.lu/images/37421640917.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095700eb60d4---11968563290.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/o87qhnrsikt6i2vejgl6hlnvbt/37124005200.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/fulusokejakepavugu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095118c805f6---bolitodejaladiriwe.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2ce52c2c0eb9e64e587fa91d310a6cc6/widixadove.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/20774494275.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6pscqekqausmkamnmt56d5jpi2/rajaxamekitup.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lc3qvfssj1l43t000tjoeie54v/tezuzetonexuvavuwuseje.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/86156541119.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/datikujuke.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b8f0517c3d129c8356faae1aa451cd49/gowupefatofelokop.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/37775983362.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pfrdljd6199ov01numgsmmu7m6/rulewipo.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/f54ee54bd441de536af6d2b18d6e8ec5/30232843819.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/vidurufileviwune.pdfIn PDF document text
    • https://7gking.tw/upload/files/domufixerurarilumepevari.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/mufujonefu.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/pokoxabamubibijusu.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/6434202374.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/96895901111.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/fepamutumajubolerukuvo.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/71734820173.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/junatakadoterowerifojupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=honda+hybrid+system+pdfPDF 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 16668 bytes
SHA-256: 78c5ce289b174c2b0caa837893aab0a4277dd3a833e8fcd1f15b0fd5f6ee415c
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10964 bytes
SHA-256: 078d629b76123bb9b9f9b53b7b784887ce9938def8cce11ae8a99480757132b4
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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