Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea15285434db961…

MALICIOUS

PDF

113.5 KB Created: 2021-07-22 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 505419609a867abe04f0ffe8e8b95b82 SHA-1: 86a5e0e4eec130c540fe66ee42ebe754a57dfbad SHA-256: aea15285434db961b4cf5cd1eed7def805f88a25a75b0af7a6a085b277f6b00a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely related to exploiting users via these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://agnieszkapawlik.com/userfiles/file/14534990056.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/085b8806233fc133454d124f01820ce5/xetabape.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42bed0c259baf79cb003bd8f99c52332/62569526180.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lu9mm5sats8u7c061e46ckohd2/jewepipul.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/damilopekixuxe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hbdp299pbsp94kb0u8tpmkd71g/xukigosunopona.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/96710462334.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mem84u1uk4h9v7o5o4kfksnff0/vusuw.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/bf1c828f0535ff01ec41ece9c59ee1ae/92910394722.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/049e3c3f36b73116d4cd233c02ab3dcc/43450428157.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/80544042234.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/lifitegotepumalesobuk.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/98944749596.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608267d2c2400---53775597188.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/50062404273.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e13340a00c04d7732280d420754e4e2f/baronozepenizenegibagata.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/zatuwelulefurodetinezav.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///78724769009.pdfIn PDF document text
    • https://ivanamihic.com//files/doranosutorojosifomiruj.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2ebaff6415fe9142bc2239a3de5604c2/lalovarebu.pdfIn PDF document text
    • http://tecnicamistasnc.it/file/20488790310.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ea83377---32468265008.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/10733044959.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xabojazib.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/aaacdf3df6adeb1646b2ac4370eed625/zabiwenomomakikikevi.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/26032181395.pdfIn PDF document text
    • http://detector-billetes.com/Imagenes/file/57761498200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+two+dimensional+shapesPDF 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_off00015985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 10836 bytes
SHA-256: 5b03b688fd1a9dd166807a4aa1a97bc6ee3771127199967c22c31c9407801366
font_01_sfnt_off00017256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17256 17256 bytes
SHA-256: 47b21c6cd6f6e674168b06d3f545d46266406755206b44b12b5eab1d7656b2b5
font_02_sfnt_off00019f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1