Malicious PDF — malware analysis report

Static analysis result for SHA-256 079b4de5e6036624…

MALICIOUS

PDF

87.4 KB Created: 2021-08-20 14:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6bbaf671ee51b6fa3feb0e89474f4a4 SHA-1: da3a003a066dcf592fdbdcc1d635eea8a92aa29e SHA-256: 079b4de5e603662432f286d4fba2f0a8d677bae2343b600662817ba286000db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608384983a3ae---49212512996.pdf In PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/76729799063.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2626aff90c8f5c9ea1966268704840ad/tilidusomuledofatij.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2d0b09980aafdb466783b351cf01b457/sosatokulisetarojetas.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/eud117mpshhvf0ti71r39bu69h/dezisofiwifodoxoti.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/14469261430.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/50549709805.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6b34ga0b242su0e9k02uouon2q/73711631196.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/kuxegov.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6f7cd556f5236c77c0f632648f6c6352/lidubekararataza.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/90353813052.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/51766fc4b4cf3b27584ee78d69774161/31869447458.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/zanira.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/349a17db0014e9878941811e421ba8ef/dinafexoxaba.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b73b2a1cee472cbec33b3dc638080c4/91092175157.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/sonaduzetozavasimux.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/tarakako.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/51978548241.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/vepazakudizanuvoxaki.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df446149cd---19903540059.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d01065bd7ee922b66d6e386d8ece86b2/genuvuvojuxiperowewumog.pdfIn PDF document text
    • http://epplast.com/files/file/zupasomunos.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e98d9db284ba4be6e8598ab79bdba100/62541386525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+apply+for+a+loan+at+capitecPDF 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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10496 bytes
SHA-256: 2010425ed1b3e12e27498bb91879c539256a2472f9f35782b8db34a7dbcedbef
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16736 bytes
SHA-256: 7e2e156b2fc2f3e8b7221db8ed589faa4a50c305b0f4341ff08e95a9dcb579b0
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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