Malicious PDF — malware analysis report

Static analysis result for SHA-256 857fbd1f4ad04f17…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 12:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d5431fb1a2ee41c3a098f39e70de34 SHA-1: 0c1401b03069c17f946b237cca32b7940da4c72f SHA-256: 857fbd1f4ad04f172b0421a1440422d1317681a48ad2038b20dfa798a69f78bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or tech-support scam pretext. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://digilit.ir/basefile/digilitir/files/92386093157.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/movenakuvipivudoluxudes.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/zuxef.pdfIn PDF document text
    • http://woykoff.hu/upload/file/26811853080.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/58751900604.pdfIn PDF document text
    • http://offerparts.com/upload/files/8792162808.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/60125452334.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kugejovir.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/megur.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/6826409443.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/58893456433.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90db6b3d6---5448180176.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6da8fc93---86837037043.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/dabedurip.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040604502710.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/jimawolisiwela.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/58280744217.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bofumizarudipogore.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/46691141516.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/17820549203.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/21543825022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+cheat+harvest+moon+friends+of+mineral+townPDF 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16900 bytes
SHA-256: d381375cdf56c934cf2e79dc27a70a3beec15b3cb82f36ceb0c8cd30e305054e
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 10924 bytes
SHA-256: 4039f22139f183f9d83031b25b55eb578cfce44ecc546fd138d01fc4f8941dc7

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