Malicious PDF — malware analysis report

Static analysis result for SHA-256 49178d0bc01ae49b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 19:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5813eaccd9e9146362e43d061ad402bf SHA-1: e4ce4c90b76ca50f5ab691461a0161163cb08989 SHA-256: 49178d0bc01ae49bfefd881981bc62a10524b443c639d69c99ec969ad2b02a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=basic+measurement+units+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2b01efa7psaiksko2dg7um6tte/limixoj.pdfIn PDF document text
    • http://topas.lt/userfiles/file/73324661927.pdfIn PDF document text
    • https://phm.vn/upload/files/nururefekelemifij.pdfIn PDF document text
    • https://successalpha.team/upload/files/wuduruzisojoluligasaxu.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/41021007870.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/40403d633f1633d9623f8f15084f7c9b/42709887259.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/wuwofosisakapax.pdfIn PDF document text
    • http://elitacasa.it/images/file/moveri.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/pbfmjf6p1hieibqgt0hssmokm7/zominu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t2og3kvdohklghapdrobsjuc07/26525123211.pdfIn PDF document text
    • http://philipsphotographystudio.com/82452445578.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076847e0feff---80789849711.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/glr4c4bobcf1l4gu8b19qbdak8/13315380237.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/34458258723.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/85481637734.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/m2h7nq5mb7ij6c7o4fggrtgr52/xebinopumenolawutopoxozow.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68bc937eae---gibuxuramiwemizupum.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/digutabonozugupo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/koxozufimoxawoga.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/82044869960.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/jebevopagidijusorerumaw.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd1455c08---mazusidozozevat.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9e5dc9fbf5f58b28a873c192fa43c9b5/4494165489.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/02fda8dff2a3234092b36907c8ca3ca3/jisiribi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/686b59e75f36f7ac73b1973c69fc5138/gomoseromema.pdfIn PDF document text
    • 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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 17736 bytes
SHA-256: 09fd04ea0143bfbca0720e6481a42992c6753b58bc39a83f8e99e02e5f7da62f
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 10768 bytes
SHA-256: 52c6c816b6811d1b6ba65e7a8a2274799acaabad7a72f9e1d306f392e5d2a0b0

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