Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cda38a57044b6c…

MALICIOUS

PDF

97.3 KB Created: 2021-06-27 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b704e81a8073d4a636c284765723db92 SHA-1: 8586aa187abdf7d600691a4db5b1e7c1ff147d98 SHA-256: 96cda38a57044b6cacc0010cb75a0a78b458a6668575225315d3a5d3e7718787
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external PDFs hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent to trick users into downloading harmful content or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca51bde09---44892417594.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/safiluzezokugarinefinu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17ea16e14---5217615480.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1e2914c9---23723834697.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/39287a82e858c1e58b6d184c42be96bd/56761110536.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e424f210---37406031151.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/19f32e32ac9da5ae7633a0b03bf11c6a/7105731930.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7921e5dc1d701552f6ecb5e36c240a80/sowigagopeniwuv.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072814d61435---9629128284.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/df6d1afc20c81eef99fa74291e0ad8e8/54735317172.pdf
    • https://armagedonspedycja.pl/files/file/vasukididiteroduw.pdf
    • http://feach.ie/images/uploads/file/jejinojufatipizozigun.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/013b065bd23e64ec97cfe5334c8f6a19/69674780512.pdf
    • http://bhk-aindling.com/userfiles/files/25597465128.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32f57c4fa---11919274818.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084af712c8f9---98284500881.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160accddb9d256---bakemevinonul.pdf
    • http://www.prieteniitehnicii.ro/documente/file/negopipajusu.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/86eb3f7888aebf34ae2261e234fb6c37/22362402843.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085453b6d146---bowevominezomofijo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160854eafdc212---tirakegizudisoniberaweno.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925f4000ca2---poxek.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3dd01dfd---94616248525.pdf
    • http://architettotoma.it/userfiles/files/70330202469.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160839f1a0f516---bebajovepolujumov.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f411a1c805---23001583590.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/9562f048dc54360cf50a0d1fc3c341e1/80478736599.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+how+to+build+a+wither+storm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116d0.bin
01e4a5345b3731c4fc055dc0a1d64881a8acc1b57927840f172ce070a01fb4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 11060 bytes
font_01_sfnt_off00013067.bin
315a4999559c72f132089529d1c24af04bc841da8ac82bd44732d6b8316b2242
pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 17948 bytes
font_02_sfnt_off00015f69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F69 16792 bytes