Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f87102af3853b5d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14b4e1f4f28f6b5c52bb49d0011679a3 SHA-1: 378caa6edda024463be1b326f8bc66767a86ad21 SHA-256: 7f87102af3853b5dfa60ae88e798dbe0f2a9fbd0ce3d7fa65fe4aa50dd1a8f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dedanskecasinoer.dk/userfiles/file/9417912341.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae667f174b---feritifelusojo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9q64lagiu86lr6tq0336jdbgg9/viwolomaboleji.pdf
    • http://doo-san.com/userfiles/file/20210529081009.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fikuxolevuzofonapinukez.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/zoxexuv.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4a1a8ef---16825787868.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/tapamitabozabape.pdf
    • https://sportsht.com/userfiles/file/58888223721.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/safijafe.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/44148066188.pdf
    • http://tcihk.com/userfiles/wubejigoz.pdf
    • http://ajisushionline.com/uploads/files/58427337891.pdf
    • http://adaviestransportltd.com/userfiles/file/46502435941.pdf
    • http://a-swiss.com/upload/userfiles/file/23862073533.pdf
    • http://playoz.com/ckfinder/userfiles/files/22555884116.pdf
    • http://saluteebenesseresas.it/userfiles/files/50041195157.pdf
    • http://shippingengineering.com/files/ckeditorothers/fidixipirijowamefuned.pdf
    • https://mimpishio2bet.com/contents//files/xavivivexewotapuz.pdf
    • https://agmatbaa.com/upload/files/72630004836.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/65561356922.pdf
    • http://handinks.com/ckfinder/images_store/files/gikunupemevirinuwiluduga.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc3a5532f---jegodorexavawuti.pdf
    • https://giolog.biz/images/bulk_images/files/zibadajunojiziwetabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=que+es+la+bichectomia+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c0.bin
fe98440efdb1f027147051817c73e71e834a8b3ebf7ca111237ed664a76bb3b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 19240 bytes
font_01_sfnt_off00010528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
font_02_sfnt_off00011d3f.bin
79eb2fca9449cdbe61066e8867729de5a98b23c0d9e6a7a9de50d0cead651601
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10980 bytes