Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b88fe3d0fbfedf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 20:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa8917b0bb768b5d9b5aa9dba7cbeab8 SHA-1: d75fccaf93f1e2ef79412e3bb0641dbcf26b004f SHA-256: f7b88fe3d0fbfedfd9446a091be0a6b92d453d17e1748b49130b4509a2ed7334
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of numerous embedded URLs and the 'callback phishing phone lure' heuristic suggest an attempt to deceive users into visiting malicious sites or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rafautama.com/uploads/file/wikuxiziwirike.pdf In PDF document text
    • http://hoaisonland.vn/upload/files/25367560255.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/52522036c847f01387483015b252b3fe/dakimim.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/kowemixupu.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/60968115347.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/12268240170.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/16152137772.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/71109085416.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/19959074244.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/ladinubezogofejuliropedis.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/360755562612f8db980460.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/naximu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7a889ed2---48662730932.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/mivisarojutafele.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d38d5c504f78fb6f9568c9b9586b0fb9/60751621256.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/86086388865.pdfIn PDF document text
    • http://rinsacars.com/files/others/nesemukuxegirodaluta.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/sevutenexikabip.pdfIn PDF document text
    • http://medi-sen.com/files/files/pawubugano.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/27931938336.pdfIn PDF document text
    • http://methese.com/upload/files/32228232782.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/bejumamamup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+priceless+2016+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010cc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10CC8 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 21132 bytes
SHA-256: a106f560d45733d27bad96e4d7d87478d4343d12a5270ef306489a1127239cd2
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11032 bytes
SHA-256: c58bdb5cf116c5312dc0d8abf4ac824fe91b4de1909ee849742be113adde82a4
font_03_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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