Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df4b9f484294d1b…

MALICIOUS

PDF

90.2 KB Created: 2021-11-05 19:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3378213fcb1d1e83f1085dfbb303be86 SHA-1: 4d608d03dcf7b66054b0239f30548694cc28f72a SHA-256: 1df4b9f484294d1b31c574e82d90b045dc2a848fb72128d66004410b343db305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the document's primary purpose is to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ffe96db3---74911441660.pdf In PDF document text
    • https://nasikampung.info/contents/files/witezuso.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/27927443666.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/menidofenesudufowe.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/jojonigujidu.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/netatisunitokodamixesi.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/90682389513.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/bulopitidazoxiwudoxaxarev.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/totemamegiku.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/bawozatike.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/47066286849.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k18i27utdda97ptluksqinv3o3/95770766671.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bimerip.pdfIn PDF document text
    • http://nktrading.qa/file/files/13161704648.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/37210924630.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/13475682616.pdfIn PDF document text
    • http://geraldinekilkelly.ie/40839198955.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ginoliwozuned.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/dobozedug.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/jebosasodotajosazemipeju.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16181d6cf27768---bemolobipolavunixev.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/56760064607.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s7ugh1qslr6niomao5b1oi4vr1/vomedubevikutexozodezaf.pdfIn PDF document text
    • https://cityface.cz/res/file/zunuxatulapizalekumekogis.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=indian+polity+by+laxmikant+6th+edition+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 20164 bytes
SHA-256: efe53386716f4d1110ba02037b998d242cfcc33981a498f73c5b4dcce67e18a4
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 11248 bytes
SHA-256: 6c606482ead3a103910c96eb0127ed9d509c687d12dc178488543ed5ac327d76
font_03_sfnt_off00014099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14099 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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