Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39cdc033d7cb66a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 17:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e11db9a287daaa1f9ebe264100aac56d SHA-1: b626bedf2788f47b2c4378c3490f9c9d849c50c8 SHA-256: f39cdc033d7cb66a58173fd4b9da6254f65e1d0e9cd79dafa8c7ef4069664c09
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amandatravel.com/userfiles/file/37041538647.pdf
    • http://amexeuro.com/an3_Uploads/file/13351810381.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021050910517_969996333.pdf
    • https://mosconi.net/userfiles/file/86642889478.pdf
    • https://aimhc.com/userfiles/file/faderaxunevukefisuteja.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084408611de3---dojadixuxobigoduvupo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c6dc3a1a---51410155878.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/s5l73artabmc8agestmohn3eh5/62289541173.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/e6o4q6rot1v782p0r6bkdmbdv7/38822115493.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/521cf9d8521b1152a3afc8deb4d674cd/68168480720.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609833338d4fc---27878670159.pdf
    • https://b2cexpressdemo.com/userfiles/file/labaxowajegobiw.pdf
    • http://jiuxingchaoshi.com/uploads/file/261534244480.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869240c77c9---72872061867.pdf
    • http://mosjob.ru/images/file/joxomozokoxoruvoke.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aceb55b1e9e21c2eaefd9a3409656944/49597891305.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8ad2fd67---48772298778.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683de1d7aa---xafekadajokitiroxudepe.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94ba1947a---gupoxasuredelovitaf.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/suxegewu.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160759339ed8bd---zugodukadonuludijuni.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/omerul1hl5j5n5keelim968sll/97510405164.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/585330a10c0056b50766d4449bf90aa9/xakilekilemojovu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608601d3ca237---durixuv.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/p8g6hl9djjhbcuhcp5aavapsl5/61158045461.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sexy+girl+in+spanish
    • 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_off0000e8f8.bin
6884ba8ea5b45a439d65db27ac6be0813ee1743f30a15bde507f0079ef262608
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 18064 bytes
font_01_sfnt_off00011784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 16792 bytes
font_02_sfnt_off00012f9b.bin
394ced20ef9ecc7a107bbc46e227d65927a72afb163c066819e54152d78d54bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 10604 bytes