Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ec7b0737ec77e0…

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 13:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5118823e23137b337ac31d5b7a7918d3 SHA-1: 269ffbcb913e6e4084650e121bd80ef3d94c3c11 SHA-256: 44ec7b0737ec77e0e7434f33be92108bea68b75ab60410562504a0bc6586449d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using such sites to create a link farm, likely to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://szrealty.net/uploadpic/2021-5/file/2021052117212573499.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e9e2c631556c75d26e7d06581bf5ff84/52491349274.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/pedanipetowugibod.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/q8tbq21dcmhpa8nlubke6qfef8/diwulekawuvupop.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77b277554---78510825492.pdf
    • http://ecogestval.com/userfiles/file/zidafetadurifewinejidajem.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85ff3bd6e---18772919139.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/kexurebusos.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/r38ulqj75ig2lghoifm2hrsh6n/82254806870.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f28d3940f---65103180923.pdf
    • http://arci-mp.fr/admin/File/92788456352.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f660676a080ce35d95bd348f0cd8e5e9/tepogovenonawuk.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf4144ccf1b3a1e764156b7410c52038/56961188977.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/307c0c60e6af33216c6f91c156a76592/wejawupenafigon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=age+of+empires+2+conquest
    • 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_off0000f38f.bin
dcff98b74f0d11968f2bb999ba8b67e43536b3ca1b2ee273487d41e2dc07b35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 18176 bytes
font_01_sfnt_off00012259.bin
bfa735f148a46c835fefe3d97d704347cf0d666232348afe8b3bd3e30b5d51cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 10964 bytes
font_02_sfnt_off00013b8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 16792 bytes

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