Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bae61e80a3521a5…

MALICIOUS

PDF

88.4 KB Created: 2021-07-14 03:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bad9b626fcd0280f973d237d3f34cdfb SHA-1: 126f3553e8e45a50ac52226193056bacdf88638e SHA-256: 7bae61e80a3521a54c20a0df43291b5ca851be6a9f335f6424f9510743183dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/47a24c94d2af00d319ac6c8752e23c39/wogepomesin.pdf
    • http://ledins.lv/cms/file/24901162671.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2ab075dd---67121650728.pdf
    • http://dolphinegypt.net/userfiles/file/zitevojo.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/i3noedim871nt75uv1eukusk97/jowopadinozapaleje.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c2229c52a5c2c9feabf0f266afdc7f9/deverebab.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d093c6194de---wibofer.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/42gc8e6dnn93s5um9i218g9c84/kateju.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808502cefc4---52195373714.pdf
    • http://hanasushi6.com/uploads/files/30456886834.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdf
    • http://autoscuolauniversale.it/userfiles/files/pubudaxiko.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e73f61eccd3---18783123289.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/7393330809.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/85011578252.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cueh3t8ahrtkncpofnt5p0rblj/sukiru.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ra8lr0pafgs5akk8ploi0tkihg/86739286918.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/049b3b8710745efb34b4b482cb611bde/46791642102.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dd518fdc07387a65d86dd16d34c02d51/29187467382.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b997278e7---tekap.pdf
    • https://myparrotfood.com/user_files/files/83566952824.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dc555454---47125316862.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c982192427a---birodegujujoroxezekoju.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/fadepobezezigasuvode.pdf
    • http://aite-materials.com/upfiles/file/36735735436.pdf
    • https://hoakhanh.vn/uploads/image/files/20554251609.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c340c99d---bexuwugomajog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vygotsky%27s+zone+of+proximal+development+in+the+classroom
    • 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_off0000f23e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
font_01_sfnt_off00010a55.bin
a3e387857009372f75ab5b9195e2c2fe59c2841925b6f90f84ff52f523e502f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 11504 bytes
font_02_sfnt_off00012554.bin
015a827b2cc9a027872a5bc2d893a894c854727494537be8986061148f65a2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 17076 bytes

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