Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc4a0a5298baf0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 08:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58587bdf27efc93abe17f3ce2f3ce2a6 SHA-1: 76c87eebb3a5a065d834a8fec69c348f1a9b7802 SHA-256: 8fbc4a0a5298baf025dacd4ae5d59e217308fe0ee47b9e92ad51cafeee687cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69034877960.pdf In PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/25668476954.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/rosipizaxixolonolevolu.pdfIn PDF document text
    • http://theponghop.com/upload/files/wepesipomizowiwepivo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc36d0803---96488823940.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kozoxorosuro.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/debufexiduzu.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/64023276003.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36614285028.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee12c92049---kufojasif.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/figapusigobo.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/kotulaxenijina.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/juzolopotemutanuxusopofab.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/gapeximemok.pdfIn PDF document text
    • http://fitviewer.info/files/file/68668177689.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2501eea2bebbf0d4470b34907cc4e31b/86918209760.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/13417681075.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6e61e0cdec7a72d809ebbfe9e5fce8bd/lugazitezuposevozi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bimeputupafimixagilagixo.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/18956982367.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/lekif.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/19580936439.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/nuwefijaxuvixixofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+fire+red+rPDF 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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 10136 bytes
SHA-256: 66136d8970346ddba1d59806a3ee3257b281ed02986a92920c67b5a84a55710e
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 17284 bytes
SHA-256: 6b438b2d56f7226f05d37c93fabc0c11528ce9c62b1bfb8eaa8916902833ac03
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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