Malicious PDF — malware analysis report

Static analysis result for SHA-256 3becdd9516002822…

MALICIOUS

PDF

75.6 KB Created: 2021-10-06 02:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8886cbc7649e2e8ab13154affec7611b SHA-1: 3c34277aaa81539e2e37b404affa97501fb852b5 SHA-256: 3becdd95160028222371a6c303c45af832dd8a90e06001328ca08e4f544ffe01
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gruppopolidori.com/upload/image/file/88739612631.pdf
    • https://audit-advisers.com/userfiles/file/32570179445.pdf
    • https://ego-sofa.tw/uploads/files/202109251710233153.pdf
    • http://champaigncursillo.com/userfiles/file/92940694666.pdf
    • https://matfplayer.com/calisma2/files/uploads/78455581699.pdf
    • http://dui-antidote.net/images/userfiles/file/76627810783.pdf
    • https://ckmusicdesign.nl/userfiles/file/16995916009.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/59888826167.pdf
    • http://guidesdugrandlarge.fr/images/import/file/bozopoku.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b7545ab9fca092184b863b2268fb490b/kififimowofapogi.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/4111113550.pdf
    • http://simoncaulkin.com/images/14591405473.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/20853073183.pdf
    • http://gocoachfox.com/userfiles/file/29862871174.pdf
    • http://alarcon-v.com/editor_upload_image/file/50573730097.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tapufoge.pdf
    • http://sunwisechem.com/Uploadfiles/files/56603919452.pdf
    • https://contemporaryteas.in/admin/uploads/file/6775100284.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec1c19230---81973794470.pdf
    • http://kbchina.de/upload/duboduxeravodunusuxevanu.pdf
    • http://muzeumostrowiec.pl/obrazy/file/xipaxina.pdf
    • https://repare-ton-smartphone.com/userfiles/file/dilenekowojodafiwinowulub.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161419d00f32cd---xukuregazap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lovers+day+pics
    • 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_off0000c599.bin
590d101b8cbaee3545c9e312775e7631f310d1b6f9a30916b4229d0259300fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 10396 bytes
font_01_sfnt_off0000dd47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
font_02_sfnt_off0000f559.bin
a4f2c43a75536013c0a9a9ae4252b57acc939329a799f5336b89209cd79cdef4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 17200 bytes