Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dd104d9e5ded0f…

MALICIOUS

PDF

80.8 KB Created: 2021-07-02 08:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eae24286698cf5be2644150444a2896 SHA-1: 95120ad9ff1fd5c76b6a92b15999b2fe58d9037e SHA-256: 39dd104d9e5ded0f96e05903aedb3531242275affad8a8dc3e7dc929583b3520
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ac59617e91e5bb830344484a79f294c/furutukuw.pdf
    • http://ya-ke.cn/admin/upload/1333410468.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/969779a385f7dbcd860fc6ecc85735d6/73567984657.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010911b685---bodezajepivenumutid.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dce430f5---gagitefanugonerubarikari.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6b110870---73793020138.pdf
    • http://www.netcorp.hu/data/editorfile/nujilalave.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864adaf3bcc---xememipogogaboxipenukot.pdf
    • http://www.findvoters.com/userfiles/file/suvinatizojelijukafefaw.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/fupegiwekewanu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/i1802cd6ie6vql821s7l1aot7k/domar.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/v3b5nm77qoio1jklupe7kq94km/suwuju.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d3487e9---96484358023.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rojilezupisumiduriresuvi.pdf
    • http://clairvoyantinfotech.com/demo/images/xipugufi.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef5d8d3c8---83100312914.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ttd1vsc3f4l5n91lh5d770dg77/besurijifo.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a134dd5e42---53781222407.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c475ed8da3fae2e3701d4c196059b034/wurupoda.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e1a957db8876c07ee6c3ff53498a6f70/58056694112.pdf
    • http://abpaluso.com/upload/file/92377046558.pdf
    • http://xboxheerlen.nl/userfiles/file/minimeniji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=test+2+answers
    • 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_off0000da6a.bin
35e35fec23b06c85304a336b2d870bb82d0620114ecdbea364c588f3f97e13e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 10012 bytes
font_01_sfnt_off0000f0f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16792 bytes
font_02_sfnt_off00010903.bin
e26fb197f66be1dec4aa84194494eed2f43efc68dd8039b59232806b1eb5cec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 17508 bytes