Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc8f3be5c151af…

MALICIOUS

PDF

101.9 KB Created: 2021-06-17 18:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b803c8ec90ec0d23ac45b666f575863 SHA-1: a23b4356144404fe1c44c165e7dff728cfd49e36 SHA-256: cadc8f3be5c151af615ffd39ce75796ff4c9a686ab260d279aa01cc7a88341a8
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals numerous embedded URLs, many pointing to compromised WordPress sites and using disposable hosting, characteristic of link farms designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://stmarys-perthamboy.com/upload/File/zazuradak.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9340cb2549700d1f4c73f008111cbf41/dopaxivasiwovidi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a04e0f9a---20058639299.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd907e00a---jixazimaxudolovitilejekas.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/95d32b79889eedf5d7d7542af236a4cd/jatexanide.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021616446283411.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/800e80d9990d11d373b46e5c53970715/jomizenefujofufotok.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/86a4a7bfc50028a76df38e47bf5b2f98/5520353368.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda23704d0---76045836004.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55c8f0c16---besosovamazisetugibida.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/ridedilunul.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c8f0b0ea634412a9c0d44544044c7fc1/liriwupexakujedufara.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbcadd707---rurusozatu.pdfPDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e6c2c08a---98969874472.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qe76m6ra48pdqpgjemqphhgqo2/63524274868.pdfIn PDF document text
    • http://drironcat.com/images/file/36665951379.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02dfe710e---zolibakiwuguve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=item+id+ark+ps4PDF 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_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 4736 bytes
SHA-256: 28ef8a6c3f081fcba759b27e75ca23fea9be30a07a20e309c307a3dd7b299ea8
font_01_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 11980 bytes
SHA-256: c95e6c404ef3ab264c821b6bed2ee36801f24c7c9a4f8a2dad2ecb679d33281e
font_02_sfnt_off000166e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E9 16140 bytes
SHA-256: 37d0c007c0a4f7bc8a10091960c820b0c2e7b87c858fe467d0565ee1a1a9b473
font_03_sfnt_off00017be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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