Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a3e72ea5986584…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 16:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 476df2b2e161d965ee56aadc35b6f469 SHA-1: 306a49ab44db5d49862e74f0b12f7d51fdee36c7 SHA-256: a0a3e72ea5986584dc1acbc61e0ee65004b9d8a7175e4d982f911132e1cf5f78
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is unreadable, but the heuristics indicate a malicious intent related to external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/86923593590.pdf In PDF document text
    • https://kermanrooz.com/img/files/zakelefatezonekefibun.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d75b4efc---resugegowek.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f6c334e767980d7c875f282181aedd94/43051273438.pdfIn PDF document text
    • https://davaocarrental.com/images/file/1708638861.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077830a9904e---26030821575.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072678d2acf6---besujobibakamasura.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/11031299186.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/wixazumoxemezaxajupas.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d84a478---27940306008.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vosolegome.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/mufadebap.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5egaqcalp3397op6hstesv4470/33984829889.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210812183226.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/gujilo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9r86821rjipjlthjptkpb40qc1/lajoribifawujuwomibaru.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/vomumolu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/adaf9ebd32fd034ec4a0197990eb2c60/goketirawuda.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210624212854.pdfIn PDF document text
    • https://digireg.li/upload/rogurarevalixugi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/muponimagiseda.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16297679871292942265.pdfIn PDF document text
    • http://winso.tw/userfiles/file/37516171171.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xogirojakumivo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7amvl62b2snbdirv9s7en6d203/dobufota.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d93063b6b09---vanirikixumisuwepobeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hyperbole+in+poetry+worksheetsPDF 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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 10608 bytes
SHA-256: 3b56f3203c9646c85b75d3e3c6d7cd58e7492e7da68d2540c686311df88db677
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 17352 bytes
SHA-256: b4e5adc21752cd766d8946918947d5b4fff654ceb57ae3be7d26ce4f0673a741
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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