Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bae7e20cf10749a…

MALICIOUS

PDF

103.4 KB Created: 2021-09-07 23:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da92584e94b9aa4d67fb77bcb9c7dcbd SHA-1: 1b19c4fe5ec5c6c1038e0f1f0f399fa253dcce1b SHA-256: 0bae7e20cf10749a9b0677841e58a89711aec99f7ad2afadea0cb3423b043244
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://24cvety.ru/upload/files/52199338455.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0b58029d---biruvumijefitidido.pdfPDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e943a5aa924---lewatunutuwaj.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fu8uu4a003j513ofuu3setumv6/zilememimubujagavosili.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/vafovidezelataxesizu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b6617c45---zovigalino.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88c0b0351faf9fcb891c568e1b5d925b/womulutilifadafe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zuberokuvigusumusasuv.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/35693533398.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/puwasopalokajowutimufaz.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/ravewab.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/rolokufodigufit.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4a4d9152d54f2c7fc7501b0e40a5bc0e/futimejubituruv.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c18c33096ce4a7c525985ea021ba3351/26856842508.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/wujutodaded.pdfIn PDF document text
    • http://glassick.com/userfiles/file/ziwasavapuluvex.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5it1og8p1uo5v1dujv4bs37gep/bunuxuwesi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/xexubidokifoguxowagilu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q2flb2b64u6jfglh9hnd5th6o3/87733512378.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219701506187.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/tiwakikalej.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/19848189451.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zikexuwel.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/80156794878.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b88df8cbcce4e61d5e818bcab1522ccc/69832281130.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/25376059694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=importance+of+directive+principles+of+state+policy+pdfPDF 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_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 10912 bytes
SHA-256: da5c5b22c2a8d12a266c7de110ff930ef92030231ad58e8c09002d7601cd48b9
font_02_sfnt_off00014443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 19660 bytes
SHA-256: e3a29f92171ef68b21f79625546f18cfcbf6335b4ee065f64db228210251b929

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