Malicious PDF — malware analysis report

Static analysis result for SHA-256 0878cf2ec7feeac8…

MALICIOUS

PDF

178.7 KB Created: 2021-06-18 23:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e48fb8f59515b1b2ec4bf99db39ea751 SHA-1: bd3c8f5b920f95dfc17b015efc2fd9ac38a8ed17 SHA-256: 0878cf2ec7feeac80ba30a5a8020736d8befb32d81969f2d021494082a126f14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'Deutsch lernen mit dialogen pdf', likely a phishing pretext to entice users to click on the embedded links. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/5cbd3113562b7feb7f7344cf05f6d229/2547796568.pdf In PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/gepetijaxarovimadukedoje.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6ec5d8a6c12943089861d52f834f5a60/zojolavufefonezopuzejim.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a15f1007e---77722057564.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/47418487308.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/56941922028.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e110827e6---69758802435.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/395d74fd5ba7aeacd826def6ed7255a6/58606818864.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b227c8eba0---zofusuwisalabib.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1707a1b041---vukoxojapoju.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa831aa69---nutamolijuwupakudavuje.pdfIn PDF document text
    • http://derma-dts.de/files/file/tujoderate.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/52451994125.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5bb188b5---baroleregi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rabuk.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1bfef84963196c6aa536722cf05d721b/badutonotozozaxedobajiko.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b318ace8777---83082721676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=deutsch+lernen+mit+dialogen+pdfPDF 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://scripts.sil.org/OFLIn 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_off00025431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25431 5424 bytes
SHA-256: debcd2ed47559b43197e851128414302a99643546e17baeff7b9adef89a836aa
font_01_sfnt_off000266dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266DD 5568 bytes
SHA-256: 0941ebf49c2125a8dc84698fc6ff6be8ac89ae94dbaeaf261a4a327fd3cbed6e
font_02_sfnt_off000279a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279A6 11228 bytes
SHA-256: b7105fffe1dd81f13c9d7dfbd306b089d3b4875bb226528dc92e6694283dfbb1
font_03_sfnt_off00029e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E41 18328 bytes
SHA-256: 74b3fdf9fd6fbc602937b8b0e38d1c71ade54917149cc93cf9c43cc2b9dab06d

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