Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabcdbccd61271eb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 10:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffab8ddc65d3a7e259028227d5b3255a SHA-1: c63039da7f0d527a9591cea8bdb2830818c6fc42 SHA-256: aabcdbccd61271eb7704aba0c089a808a50e94f55f74ac13a92084f007dfba96
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://olddieselparts.com/ckfinder/userfiles/files/vodijoji.pdf In PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/30925798168.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49325955199.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/97044184288.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/mabubumidozuguvorewave.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89c534007bb288e8de5c2a163b733d0c/1580918891.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/demetawexev.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/jatirixeloporegami.pdfIn PDF document text
    • https://venus-forever.com/image/files/36511885574.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903075055.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/64265028893.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/32687617435.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/fujomebamomonutopajagibod.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a58e705bc---napuzukubililiwukijigib.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/19975426635.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/16482530725.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/32792067494.pdfIn PDF document text
    • https://nexusmediation.nl/files/79533344723.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/mafunalajaga.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/voban.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/23169412528.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/40278207341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=arm+assembly+language+programming+100+examples+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 11356 bytes
SHA-256: 8c82e7fb11fa7a6f85b0e0253b780209726daa752a39231695fd487ce04a4e30
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 17524 bytes
SHA-256: 3dbdf1fa957ff42c2f37341d3656f0b4c1800331962990112863e8415827c14e