Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1bd58899a41940…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 12:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baab3bee070bbaafcc4848273e3292a6 SHA-1: ed439b438dc42d9857a8d11888121ccb6016a7ce SHA-256: ad1bd58899a41940033961a17ed37680ff935f6050678ec51cc487b64fafc70f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=costal+cartilage+type
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/072bc31932f596a7d0ddf6b533f934bd/figuga.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/605011593.pdf
    • https://gikguamerica.com/userfiles/file/befew.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/qui77ibr92i6rtgekma1p67q1g/sajedamopufemevazoz.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/96834444579.pdf
    • http://ongnuocdenhat.com/upload/files/61522343714.pdf
    • http://amandamaitland.com/images/file/21800616664.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ffc2a5c9---29631285733.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/moid0334fhn9f2jtvkvi1mq0rv/jogiwav.pdf
    • http://curry-box-deluxe.de/userfiles/file/391553763.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/9c56e7161ecf623fc76674ded995f45f/94045378243.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/rubozodulanedigodek.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f780f0ef64f8f41af08d5b7177a6a410/44796188837.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/05op0p4sjrlcbqumj2odgq5jsk/zidetokanitukuponomudor.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e325d818da---9600422766.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/480eff64e88f3495b62e1008265898f0/zigikopiv.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/goatkr4ghircnluem59r3ih4b6/ruxukop.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3aa0e6db9f7d52a8dc47c9c14cb4db36/kofefuw.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/6564900275.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce2973f6---xusopulorowekirazotilif.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5a8b13202059f8fdc04f1c822bb03c7e/jegaxomabul.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d063382496a3921b1c13b690b58eda98/botupavosobarafolikemefam.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g84m1qon3qgkju3r9td6lr0p9r/puzuzugovowanudakutimote.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83cf9575c70c7a6ca8121b75432bdf83/49275490969.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_off0000e8c0.bin
3554a257587360dc60e17ffc23ce223369362eb1dd4477f72b4e733928c3f27e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10588 bytes
font_01_sfnt_off00010124.bin
911321fb907a38e2cf2cc717984f6009d1b550d6c69306e8350dc283967812d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16936 bytes
font_02_sfnt_off00012cfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16792 bytes