Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5972e138b08e46…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 01:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f4557c2ebe525f5735dca54963eec33 SHA-1: 9c6775ca6b009f66a579c34d3d489fa2d8ff7052 SHA-256: 5c5972e138b08e463220b0b9b9b0687e934c7090e4fa49ae6866b691f1fbe39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as a phishing trojan by ClamAV and ML classifiers. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fengshan-zhennangong.org/upload/ckfinder/files/gifalisasisegoboxegipix.pdf
    • http://petgears.com/app/webroot/files/file/31498803767.pdf
    • https://pgprojekt.pl/Upload/file/72182551148.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/xawekaganekanijabeku.pdf
    • http://dreamwith.gni.kr/ckupload/files/68319756735.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376383ddc47---92110721907.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/42445978282.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135c8e0d1dd7---dofexe.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/piximaxezoni.pdf
    • http://maidichike.com/upload/files/zogofulijoweduvumopiso.pdf
    • https://zemiigori.com/uploads/file/92500177014.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/poposekoxodi.pdf
    • http://cedule-plachty.cz/files/file/77862044591.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88809026761.pdf
    • http://jatechkj.pl/upload/fck/file/11791421000.pdf
    • http://huerural.com/uploads/image/files/butofawirisura.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/moxuporutoxulej.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fa6d25e0---fapugiforaf.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4ed927c9---16190800040.pdf
    • http://olymp-kiev.com/temp/fckeditor/file/luzomiwapekitagi.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d5077dfe264183c31a93649c990ace68/30896844431.pdf
    • http://debeleven.net/UserFiles/File/65212303875.pdf
    • http://leylatoprak.com/userfiles/file/77550550536.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dr+seuss+stories+online+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_off0000d9d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 16792 bytes
font_01_sfnt_off0000f1ef.bin
bb705628183d6e0d420295526d4c1fd420ed09d8e866656463e3348440259922
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10428 bytes
font_02_sfnt_off000109a2.bin
14385a56a30788a0752a98462dd94cc187bdaf65c98aac95e0704e392f2f7b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 17996 bytes