Malicious PDF — malware analysis report

Static analysis result for SHA-256 351c70ee173fb036…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 17:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca22b70100bd01040dd759d865173e53 SHA-1: 0884163fd032064b6b7bf18334a69983bc61cf32 SHA-256: 351c70ee173fb036e3ca5610f1fc5c21df323dbfdd0714bed75cad96d930fb86
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ae8lr1o7p6087lfl2qp8sf06a1/82825796422.pdf In PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/komobagixikigugunesudufa.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/586cf6944080d1c8f0c1297721615274/22110469845.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7kk6q1c4clugtq0cl1b163d50r/xewub.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a417ea9e8---50401366378.pdfIn PDF document text
    • https://olterus.info/contents/files/timepimoponino.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bubimivamebefux.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rufuwuredobasu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077de9bc7bb1---sosozuri.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/lipoxowozeb.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ebaa95f8---84515320704.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xiwamitebadegivalumafe.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v4jpol71cvck6mvq4ten6t7bk0/63021927589.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/81340102995.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16244722202315.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/53521231993.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/82892680905.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vumewaj.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/7498778095.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd79f49716a---47744071816.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6d16e3de7---laditefute.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/ginaditekebimuboxilenuzak.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3dad04765cde2780d24085b1bc8f97dc/82757526000.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/56215402357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=conjugation+of+spanish+verbs+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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 15688 bytes
SHA-256: fa115a151e23f3720ff58f22dd5eea36e4af9b2e5b59b1d565efe056193297d3
font_02_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 11200 bytes
SHA-256: ac8a8720787ef4949f4178a4fcbe112a0b4ff8393d86f8a95b406eae5fd4ebea

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