Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f114ad1df39d0b…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 16:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 137e981ce26e74b531433640f3eb6310 SHA-1: 50c4807553c07b2c22356112f4ef0e9accc64ede SHA-256: 90f114ad1df39d0bc2b3240b257d981f386a461dff961f1fea075cd545ab1b98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites, including those using WordPress plugins for file uploads. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://slsnn.ru/content/file/fetirezivakezo.pdf In PDF document text
    • http://myxroad.com/upload/userfiles/file///15008723673.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9a32e38dd25be6ec2e7be507d0ae5d18/31959823235.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/deselikaf.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/3711042163.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948de841532---51965702159.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/91482154549.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098a464b709a---18195450157.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jibamiwixedoza.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gejudakakelebunosup.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/94810178636.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/30706747508.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8759e8c078---bowuzebavupefoxo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sk5iisv9gr9i4b45c7c3o3qrj4/luwimekixekag.pdfIn PDF document text
    • https://2acontractor.it/images/file/kezipavoxore.pdfIn PDF document text
    • http://mega.kz/media/upload/files/94506838524.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6eb33c17b2dfaa5cf8bd6dbdd375f7bb/letikofi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cc92113bd---86108690562.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/futis.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7c361ec6---nuzewivokotobetazizom.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081551651a3f---71379586512.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b97fc996a722f4933e62b3509cfa8a86/59171001216.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1169e9d27---44585629215.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/2d0j5pd0vkq8lp4rlhb7esf62r/88262507112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=st+paul+orchestraPDF link annotation
    • 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10452 bytes
SHA-256: 3fdb8fabab9bc717bc7726e234b7812ff7fc996d6dbfa13bd074b46f4c1f2416
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 17912 bytes
SHA-256: b9808c053cf9700a92029532f4b36517fd022eeb5df28ab3923074d297054f7b
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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