Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a556daa6456475a…

MALICIOUS

PDF

83.9 KB Created: 2021-08-13 07:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ccc705d92a400d0fee2fd2417602a5e SHA-1: 7cf8fa35564d58c1302fb72bdadb0538de448746 SHA-256: 1a556daa6456475aee80aefb787a4ffe855f513c8f6f6b376df9552d9a9e203a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting it is used to host malicious content or redirect users. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, likely designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6353e02bf---51629166765.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca994a124c---30172802015.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67b739849---1241908324.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/91211616999.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/zagemawajevizimitago.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210612030502.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/disarozegaz.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5b2161af2426f9a278bb5ce6a8a8b4f7/banatapisewomiro.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/77655666040.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c13d17c75---wozowalinodabebu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xarajaxadozigutikixe.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zadaxa.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/93299488160.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bekudubalad.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc27cdc98c---34065892495.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/59226030026.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/40583424934.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cb9ab8ee5d3c7e2ccc9c55e67a63418c/27230126512.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/87632077641.pdfIn PDF document text
    • http://juha.be/_files/file/67015083892.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/805a3b4de995fcc47db9495a3919ef0b/18544503734.pdfIn PDF document text
    • http://kesifveotesi.com/files/95505077621.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccfa1d7113302080eab9ebda2e4c1fc0/dotomodemubeziwexovaji.pdfIn PDF document text
    • http://mrybalko.ru/files/vodiwanezumanotoxa.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/68462115326.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/38376073726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pas+requirements+and+wfhm+offerPDF 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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 17216 bytes
SHA-256: 91a9530586c47c5613e85a7a3258f67f0c54230a9db6ac3589508de955f83771
font_01_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10908 bytes
SHA-256: 63b78790acaf2541a022b9e7583210b91fec71bc70fe2346fc9b03693a123564
font_02_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1