Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d028c1dc8c542c7…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 07:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296118047f8b8ee873cfd0f3c516d4b1 SHA-1: 8eb2c13473150279f1756a638e211a024468f161 SHA-256: 4d028c1dc8c542c779e030f1529e55a42cb954cbc4e01012576b988121af26a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://adaviestransportltd.com/userfiles/file/kolage.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e17254d5e---29508603973.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ks6kkc3tbhsupu6qabs2fjr9ks/bozomusalijadubexix.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ecc1ebf939f7800e7056454f90892863/49694215246.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/abc39fa6fbb491633f3e9ec3b907d171/tadiburu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f57913197---66985280379.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb1118846---webovixolinejikidaravawor.pdf
    • http://aeronautike.com/userfiles/file/18450898835.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0a4b09edd372879d8652d0b85b745f0b/reverigirivonogegal.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/da4cb5993fd8cd8cf8a006203504c625/vevuxitegipi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac424ec80d1---jawolesedibawolu.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/26217916462.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0e03cc11596981da12b735d181d540e1/rejinara.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9868a027---wudewexeke.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d92f00d6c2fc00e126ba0ccd20a35033/bupimitetasud.pdf
    • https://argumentua.com/i/file/baliwudosuwus.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r652are653sagp6o10312l7el9/85108677255.pdf
    • http://backupcenters.com/userfiles/file/tojanotul.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608db551a8d0c---20120621279.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/npo1pd38c6ktfqco0l6hki62e0/32676984261.pdf
    • https://numen-wow.com/userfiles/cloud//files/lurifuxafuxew.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ddf70ff9---53714455320.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d563874270f3ac2dc7d81639ae9152a4/28778550133.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=house+of+cards+7
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdbc9bda6---zanonigijijet.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_off0000cecc.bin
16a3051b6304c0eb457b6f15baffcf45ac1b00f6bfe60e5ffa7e11e3fc9983d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 10268 bytes
font_01_sfnt_off0000e613.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16792 bytes
font_02_sfnt_off0000fe25.bin
bacfcb0549151a0085e87671b407d3fb5dad962501448b0b242cab7137c383fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 16484 bytes

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