Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ee557621d3f143…

MALICIOUS

PDF

108.1 KB Created: 2021-08-16 17:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 726e02115ad221c7cbbe30c78fbd994f SHA-1: ee5152b12f0cfb78b9ecbdf109c7461904deb6fa SHA-256: e4ee557621d3f143def888e125d9cccc44b07ca5a70b9eee1adf76e26a8f3bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the ultimate destination of the malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=antihypertensive+drugs+ppt+free+download PDF link annotation
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d70e267f2a8---42630378146.pdfIn PDF document text
    • http://industrialdevices.in/uploads/xizejizavoz.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/tuzigagunabozo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738629ecdb9---rotadil.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/301501826e3cabd138c2778cb852b099/tepemifonujunone.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/vajuginupewi.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/kujizumavizepuj.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/tomuwawarasazododenad.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8fe47f45500f30db84085a2050e9550c/85434171859.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f204404d3---bowapenorof.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/s028mhqv7bfljsuqpi6shd37j4/78480247402.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e08d6be3c---lewudofelipebutuwodisen.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4b920f3d60319f1eb867d1c47e1eeca3/66510765076.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dc1a8a810934533f4079ad902aa7e03c/25286437626.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/0c333eb4783dd97349cd9224c4d921ea/82037284999.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ceb5b75fa---kifewepufoposonimu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8i6cc0tidskebpohd5qi25es47/dekege.pdfIn PDF document text
    • https://razredna-nastava.net/files/92502650051.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094695a9da1b---fukejokuveki.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sobiri.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/87540972666.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7b128886a1df12b8094b6013fa329347/69634771200.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c589cfad9d0---xinajefatazizisofeso.pdfIn PDF document text
    • http://kbchina.de/upload/92754032366.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/49214a84e082369edc135cd08eecb85a/88343113797.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba450f1c3---gubokezekenujedajot.pdfIn PDF document text
    • 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_off00014154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15966 17968 bytes
SHA-256: 929f85afa49dfaab711ef7b76a2c7284733f2659790fb0ee3540e57284c73bb1
font_02_sfnt_off00018866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18866 11124 bytes
SHA-256: 31f9b4b22d7107db6f7c70c499f10754490426d67bd0d627a198adefa489772d

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