Malicious PDF — malware analysis report

Static analysis result for SHA-256 24519ff1d7c0cf34…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 11:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4682fa0892f3cc71fe9d9415a8b0b14d SHA-1: 914000553cb4746166b2bc2b9251854f9a9b89e7 SHA-256: 24519ff1d7c0cf34d6c986d7114a794f737fab8a4b8bc9ef8a7eac5714b0e711
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://afra24.com/basefile/afra24/files/gogurim.pdf In PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf09faa99b---54687694701.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/60002144582.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b89156211288adce3324192530ac1eaf/larimalanekolasazo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a449b27978---rixekowarexubot.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2937d5f6---guvoloduselixumud.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/53348875310.pdfIn PDF document text
    • http://scro.ru/pic/file/48947844489.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9985c83b6---18948116616.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210603082227.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/01qnjgumljpbdhadbmkd1ll1l6/59518879426.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wadime.pdfIn PDF document text
    • http://amandamaitland.com/images/file/54777457320.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b09a5a6a---voxujizonasetewatemozewo.pdfIn PDF document text
    • https://coevent.ru/upload/files/27639392534.pdfIn PDF document text
    • https://beltamas.by/content/Files/zozosividetubib.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/7883891783.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/6349815746.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/basisuriso.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/65191168292.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tebojisatugewodezamasogag.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/51401209760.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe23ad225---15591299308.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/mukoketetozobevo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/88802455982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+dyed+in+the+woolPDF 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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10096 bytes
SHA-256: 9266fbad89fce9596b2b0bad1e9e34d0fec859f630887dfc3be8b0bdd2b63eea
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 21152 bytes
SHA-256: e567e9c30009cdbfde96113b2162d1025f9ca737cbad8622ffede706f2f80d37
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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