Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e44a84bb6674a2…

MALICIOUS

PDF

91.6 KB Created: 2021-07-05 16:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb83382a50a94861ede6cbc2e2b7b35 SHA-1: 43e5745ad8d9b271feb4009128e173a2ca3f96a7 SHA-256: 42e44a84bb6674a224c7c47a5272a8bb8b84ac72a32cbaf579fd91e98b8856e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6ee6567da02837dc12ed8db36eb87f98/risesuremipetuwotoko.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d838d7455---22078420567.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57174877a---58333657033.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/filu3bggd6tqgj7sv45stisjuk/vexatuzawurepu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab50481b2---tomakanosu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/842a6898d1a02aff82a68d7878b34316/41244275117.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fd533dd2---50732095038.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7ft9mg9ed4bjh0d8e3d0legpee/kugesenotixopetikadajuk.pdf
    • http://www.findvoters.com/userfiles/file/linexipas.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6063ae5f---57764531197.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/9kkaprmtadvjd60d0libqvuvr5/zesegowod.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074999ac4463---23022449242.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080128ace5b8---67397092611.pdf
    • http://penzionklara.cz/userfiles/file/54346643046.pdf
    • http://lab4050.com/upload/editor/file/ludiwulikuw.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6e86af6e---sizonanoxidap.pdf
    • http://clarksville.net/wysiwygfiles/file/2427689510.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/tonajorazuxivo.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/jupg1du1an8im6dbei5j7p2qg1/durot.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae1f2dc54---sokusimenokasavakusoxuriz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c11c6634---46458986950.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0844309146---fajegakudakokimezumi.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d471020deaa---24385641388.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d758511fca---naxibedirufiganu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=investigating+the+effect+of+ph+on+amylase+activity
    • 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_off00010158.bin
b2f049cc8dd3a53bbad81f899d0f0c246d5f1be48db0072ae42f326ca9e054fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 10956 bytes
font_01_sfnt_off00011aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 16792 bytes
font_02_sfnt_off000132b7.bin
78d50d4d2470ce2cce9c5cc3208b3f078c3eb433aaea9bad44106f9c7a542d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 17612 bytes

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