Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a637982eb291e1e…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 21:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0374ca62d57dfb0fe225f5e5ef841303 SHA-1: d332cff15b347dabfd2b41ea958683ce0a7ecbc8 SHA-256: 4a637982eb291e1ee14f01f7c4e26321f75fc9daa4701ae1c38ce63c5c972293
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to phishing or malware hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://allytemp.ru/uplcv?utm_term=sql+server+begin+transaction+try+catch+rollback+example
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070160c03422---54847496434.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qg0uqg9qftu0l5v62fqfn5l8v4/lixanukogoxuxabelemep.pdf
    • http://okuninka-biale.pl/userfiles/file/51577176340.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5adb4b00b9b44cf3074fd4b7aa1ba33b/12863026405.pdf
    • http://proxima-design.cz/files/file/xokezin.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a648db62---rilawififafobe.pdf
    • http://beijingxinzhi.com/userfiles/file/20210507171110_741760604.pdf
    • http://robalton.es/Albums/images/file///fopasapulidanopakor.pdf
    • http://nomorecpapmachine.com/userfiles/files/kiboledezifapawefej.pdf
    • http://brmxn.com/userfiles/file/20210531032020_s1yx8a.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3f45920d---sibirulejivemebufamitezex.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f3142fe8723f2c694ae59be482a09e6a/xotigudesunanufokufal.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/giloxa.pdf
    • http://alptw.com/images/files/fizutalewanaraganu.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/21819247516.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c7a5f2bff70a42c98b4c74ca9e4bc6a0/95518834361.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb285b85b557c8d7b138e16bd0ff426d/dukatonubuweza.pdf
    • http://blessingsngo.in/userfiles/files/73826106255.pdf
    • https://aydin-elektrik.com/resimler/files/93180432854.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160989f729d585---80529075491.pdf
    • http://gorisum.net/fckeditor/upload_file/file/kofumuwa.pdf
    • http://cnmrobotics.com/files/files/38385527798.pdf
    • https://ludifrance.fr/userfiles/file/42370390403.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/s8r3r59r50msfb5gt2dfjq7su3/8471568576.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98684f1cf2---bejofimebasovutemope.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf8.bin
8d275300e5174dfabcc1176527c74c6b2ee8c8f4bcf77bfd1093e5cd1b018c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 17604 bytes
font_01_sfnt_off000129f5.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 1696 bytes
font_02_sfnt_off00013205.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 16792 bytes
font_03_sfnt_off00014a1c.bin
afa03387970a0b6f1f92cd92955839662194b246e0cffe927db285fc1cf3ecbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1C 11556 bytes