Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f97fee70d63596b…

MALICIOUS

PDF

105.4 KB Created: 2021-07-21 07:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6a54cb443d9681a61288a149ed1149d4 SHA-1: 3c8c7a6b97b71fa9e4c7b6aa708e5a407aeaee27 SHA-256: 5f97fee70d63596b98f40201c32b7661df9fbd69f4be22ad26c9312842d69d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092da89e510f---93158557355.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f6d982f2---zijijafazomi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/99e73ef1f56a64bb86a549b65e6c00dc/67772479358.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vibitosel.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b905a9762b27c48e3f9dbae0efb46834/nazufogu.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59798419631.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dbnrr2do6t4g2rh0u4ch819u4/63386525717.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/kupavubug.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6abd2e13a---takuxu.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/93026064991.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a21b41c4f61d4110915f7ed3c664fd52/xakira.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rekus.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rejbqnsu1b06lkoq609mqlj4j7/sivuxedifigewizerumiguw.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f092a600---medewexepafizelurazo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5fce9609eabaaf6be68e1e3ae60b04a7/14371743680.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nmktnt8kms97u429s4agq0mlv5/nulazajuxolepixosogo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc68be14f9---34995609597.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/mepikakesilakakusiguvoxo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc58bd3ddd---54313732772.pdfIn PDF document text
    • http://fitviewer.biz/files/file/larabawapapafikej.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f8da566df76882261eb8ab1dbe098f0c/45863496084.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf48880b545---bopinadefimikabojusagis.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/gudupekesu.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/55728388440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=restriction+enzymes+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CB 10792 bytes
SHA-256: 1b090df54de4a040ba0511f8fef4e7e27928034f9960fbd838207ac5be1bdda3
font_02_sfnt_off00016ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB1 17448 bytes
SHA-256: 35acc1a3b668a21c5acaeebe4d99dfb796a5516144cf0062e2cf377df30b8fe2