Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2baea71e420e60…

MALICIOUS

PDF

71.8 KB Created: 2021-09-15 16:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e81e1d0bc4eb6f524771a807609e0ee SHA-1: 78deb29d084a623170de0b336fa82e787c0d867d SHA-256: df2baea71e420e603946e53ae4d75a67a0a43fa6a40ca02990f3c7fe5a50ac0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to various domains, some of which appear to be compromised WordPress uploads or hosted on disposable infrastructure. The presence of multiple links and the use of UTM parameters suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://triangle-electronics.com/assets/userfiles/file/74840449384.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/45399872106.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/861db8ef866575eda867367dbd246043/xiwesenitixutuzad.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/98716201033.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/26795527150.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/8499465418.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/wafubedozi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/lomimibebikujupuze.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c88b233826---18510023649.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/mezajinilo.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/4156076771.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/82278685469.pdfIn PDF document text
    • http://hotstamping.pl/files/file/tasazudab.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/26118410.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/tukonufaziviri.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/46078118299.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ralon.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68514706911.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/zirefeza.pdfIn PDF document text
    • http://berbun.com/user_img/file/toxudepebugibatemobobezof.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87658494974.pdfIn PDF document text
    • https://airxps.com/userfiles/files/lerobifokodibe.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/winujikevejeli.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/viravupagosupube.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630990608.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/089ce144b5f194e58e641fed830b3c4d/zofex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=crud+kotlin+sqlitePDF 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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 10448 bytes
SHA-256: 2ca9bba0225976b2d808d5fe58d89f45e1044d8fa36a09bc805136d662e46e0c
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16832 bytes
SHA-256: 078ca99030485f3aebf005ab7436d6cd9ddfa4eb41b7160e3ab5042989b0c467
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1