Malicious PDF — malware analysis report

Static analysis result for SHA-256 a538493b89357081…

MALICIOUS

PDF

119.0 KB Created: 2021-08-17 22:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2280b6d549282eb8d4a9bd0abfd5d9a6 SHA-1: 6e70e49239a3745a5313d161653b8ec53d8f1502 SHA-256: a538493b89357081b625cd65719ec4a1395fd51f6fbefed50d38cf2150fdc16d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users. Heuristics indicate urgency and callback lures, common in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad67336ef---duzinotubu.pdf In PDF document text
    • http://www.itidharamshala.in/images/uploads/files/32167252561.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/35653791689.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16098759621257---49896329168.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/38271919583.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5368d0df---milonofime.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607067c68b109---jubimigizeg.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02182c8dcd---dutefe.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/sukenekafapa.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/45204723648.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/85b92984a53bca16fd6413eb9444e4d3/gozupuxopidebifexuv.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460b517c78---49924235926.pdfIn PDF document text
    • http://gabortech.com/admin/file/58346632916.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lolilo.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/93497779642.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108111518228466.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/10275573475.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/lazat.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c910872a448---87572152131.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/polafifonanosiwoko.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pir7ipcpstci5g9g9c6lmu580u/jekotigedomavat.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/punumejizokiti.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d77500d1e81---kerilabumizam.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae86df5a06a---luxozuz.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e2f0708b2---zigaxunowotimovutaf.pdfIn PDF document text
    • http://swift-tw.com/lcc/upload/files/89233992658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spectrum+tv+select+vs+mi+plan+latinoPDF 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_off00016a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7B 10776 bytes
SHA-256: 6275c6def08d0ee966afc30c81c8cae91ca395cbc1bf5124444bbb4e6763f852
font_01_sfnt_off00018349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18349 18768 bytes
SHA-256: ee256c9feb7b1920c9abd6018df5a23dd1b571af508d5bc54b1e2ffb24949acc
font_02_sfnt_off0001b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.