Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6415dcca8c69816…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 10:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be96fe5191b503fe3a70f6cac8dd33e3 SHA-1: 643f0b865f2d7201a16c0e78b53a66209f77d753 SHA-256: f6415dcca8c698161d8514d9f273268f626b344236592d39c8827b1936e12d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. The ML classifier also flagged it with high confidence. While no scripts were directly extracted, the PDF structure and external links suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pistant.ru/uplcv?utm_term=two+examples+of+sustainable+development
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/289d9177dc1f031be52c587c83c64b30/milamit.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5379a5380e14ff7746835bc2b827aa25/40288111798.pdf
    • http://archerelectricsupply.com/userfiles/file/roruxoketori.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8643aa61ec---74449044777.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/mavufodadobidezezel.pdf
    • http://hongshengfish.com/uploadfiles/2021062220013090000.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/16218669782.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3q1ovd6s5gv29pnjtvvtm2eqo3/41897893585.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4ebdfdbde1910e775da8879a101f75a5/60634226080.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859681f0367.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff164f601---rorunafunubisurabofemopuw.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e10e0b7c983276af2f7465c18ef2509d/24644575877.pdf
    • https://bandai-k.com/userfiles/file/41002729241.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/394406ba5ac6a30f443eab03d0d71c01/27606391000.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092d1bc62069---5155510177.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba81a93fa---20112286753.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/m6llt3jq0mom8kcf2t5c89v2cn/37106391373.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beda9e835e1---60440142012.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f260f4043---54927879192.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/juzuvijuguwi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af270fa66---24135560067.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c27338c2f56---70403681654.pdf
    • http://delvalle68.com/clients/54584/File/vetifadagejepi.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160821177bec9f---folixovosegugenirixoruz.pdf
    • 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_off0000eb63.bin
6dce6935f4a1c7cbb2728e6bcd13ac9b6f8db2bd93bd13896ab29ed5f7736a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 17828 bytes
font_01_sfnt_off00011a36.bin
26eed6a978ea890658aaf1a2d03db90cecb5845f482ca0154dae27dcdd175cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 11016 bytes
font_02_sfnt_off000133a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes

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