Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b41b7ffa6ee45c4…

MALICIOUS

PDF

90.0 KB Created: 2021-07-21 09:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0845da3982589b2600097294480d9f01 SHA-1: 6e97f083660acae11bfc64dcd9bed7e6a080ecc7 SHA-256: 3b41b7ffa6ee45c4df2df5e6f7fe4f6cd938bf622180f395d42cb1608f5eb943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://immo-cjeanpaul.lu/userfiles/files/89520440553.pdf
    • http://au-coeur-du-temps.com/userfiles/file/29106980346.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/011f8254d66c395e4bce063547e3bb27/53232618034.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823de152ff9---14864600450.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5a81c526---legufofijox.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b0156591a30ac06dd65f8b2a0470cc45/lexanosusuzafuvam.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f094823fc---65198567306.pdf
    • https://nnkcreations.com/userfiles/file/gurapebokofajususo.pdf
    • http://aal.tw/uploads/htmlupload/files/88248640566.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rc7j7ng7bn3geisq2354fr2c5c/folozimesa.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/g5cokks61g2he43qu9qa6rdgi4/47565847862.pdf
    • http://dhleisure.com/ckupload/files/28227490654.pdf
    • http://mywayrtk.info/userfiles/file/gupinumi.pdf
    • http://pantipplaza.com/userfiles/file/15388765581.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f486954a---75677132489.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c8c0371d907f6e0800a876a6642f1f9f/65280137650.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r5h01dilhg7brfq95cg9644ptv/gomumalulofejerokibaga.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/62e7a227640399d0e04e75d1e95e0dc0/mijugul.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787ce0339c---lusetesegesatigasoseru.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d8062215054bf58bb7f55993b0895ae/gisijite.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b091c88cda9---48703221654.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=compress+excel+file+to+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_off0000fd1a.bin
91e0a1111ec039052726a08bef31000d4732c74a6f2fc3eb81f17480b6afdbed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10648 bytes
font_01_sfnt_off0001157c.bin
03e14a080289a2a75abb1d9b56d6f04d8ae18b0bd483974f86cb8474f80814a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 17344 bytes
font_02_sfnt_off000142c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C7 16792 bytes