Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c44c50a4bf08b1e…

MALICIOUS

PDF

106.1 KB Created: 2021-08-13 04:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 858428488acf65672a61d4cafb618753 SHA-1: d06f55fae83f9ac1a2a0c96e6580fd8f3199fe47 SHA-256: 8c44c50a4bf08b1efa5611e08ffcd30d886698997b2713916b55a884401ca5e3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://amexeuro.com/an3_Uploads/file/tatevigudi.pdf In PDF document text
    • http://apcmagon.com/userfiles/92857479629.pdfIn PDF document text
    • http://giga.sk/storage/file/wotefej.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b7qh8p3bpih3p86f7fpf3is7n4/gufejabanukawok.pdfIn PDF document text
    • https://termofriz.rs//files/judegimiwuterapejurebag.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/55058478969.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dddf4e3629f5ccae9a74f0d367a84a2f/814388976.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/36200767064.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/332f01792a15bc0d88d8419872fc85d0/31763372393.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de830aa6c38---getuvusivalixumusal.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/38050212031.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0776ec5abc---24215876924.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/pitijizogemer.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/68620609925.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jumefomudixijirolilo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a050bcccfdb---57685475466.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b4857d17---98874741770.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/devevamisakolo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607914b37324d---gakikonijiwejif.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/91418865609.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/zidesusuruximokegupuz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7d5aa3cf1---60231458430.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210629_D71C2D91EA1D4EFD.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cuales+son+las+cartas+paulinas+de+la+biblia+catolicaPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/48631744603.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 1788 bytes
SHA-256: 7e909db6473423696c7a0a805def3366eada2c8325e465ac3ce0406b5880d5af
font_02_sfnt_off000144aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AA 10776 bytes
SHA-256: 8b02aceb9636628f136970d20fbc64cc71ba423226a52f86ac43af6fe2d86ed1
font_03_sfnt_off00015d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5B 23216 bytes
SHA-256: 8e04fda914dfbeb944bb9a5b786e8b032e50a2370171eeec17b51b31acd66cda

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