Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a010859342186…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 13:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89c7105865a3d5f600e237ab3eeca93b SHA-1: 50f2c373fb2dd643245c52659dbcb349bebef22a SHA-256: b56a010859342186ab5c938e8efc61a5d7dfab72b1a9a5ecc6fc819f7caaccf1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The presence of external URIs and links to compromised CMS uploads suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=where+can+i+stream+deadpool
    • https://westhigienia.hu/editor_up/pujokavepagonaz.pdf
    • https://betsin.org/userfiles/files/raxov.pdf
    • http://modern-pro.ru/files/file/19891252997.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140255d17abd---27036619269.pdf
    • http://styropapex.pl/userfiles/file/tijezopaf.pdf
    • http://papierplus.pl/userfiles/file/85867610683.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139509898c85---44878412634.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/tupuwekedogoti.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/tirozoxebodekujalunamosi.pdf
    • http://hyunshin.net/userfiles/file/woxusi.pdf
    • https://computerzone.pk/file/putubudebusawixifinewi.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/52421124087.pdf
    • http://sinorarechem.com/upload/files/tajemutuz.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/wofedokabadofomiginowuras.pdf
    • http://hotnews.md/upload/userfiles/files/59338781057.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1b9367a5---18031902862.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/66812427402.pdf
    • http://nieruchomosciklodzko.pl/files/file/pezagobojufa.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/wupufotubiwuseserikagug.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/4806212254.pdf
    • http://entrackintl.com/uploads/89917090511.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3da76b92---pifonepe.pdf
    • http://homokkepek.hu/editor_up/38134843000.pdf
    • http://goksirlambinowice.pl/img/upload/files/14389030023.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_off0000e0bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
font_01_sfnt_off0000f8cd.bin
1be457151073e1ff1f4d735185dafd52ce4782efe3ebf5dfa964651a40733f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 17576 bytes
font_02_sfnt_off000125d2.bin
50d35651bfd4ff7b5953460417ba438e79a648bda5ff63d5ffc87652b35383c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 10772 bytes