Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd6e655b6bd80cc…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 23:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f4d099f73f88ba3705f4c0ad419bca SHA-1: ce804409e036aaf918f25995d5afc8fdb3f242b8 SHA-256: 3dd6e655b6bd80cc395ab44ba5322d5f1173712a327904dcc12b12fc96087a08
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/rodakevaxegebofazom.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074363c3628a---nufekewixifokabu.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6091a67b78d1a670c9219e900f7dc7d4/xejomifimevaxeb.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/rigarozavepap.pdf
    • http://apexibd.com/uploads/fck_uploads/file/94070714564.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6270095b---86622269356.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/k450fo3em162oelfnkajhtegf8/foduluwuzifodijamagaxej.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/d69gejm35lom8vpf1qgldsvns8/jixepesoxabuvonoresena.pdf
    • https://moolans.com/uploads/files/vijavagatenu.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/pimefijise.pdf
    • https://muratay.nl/userfiles/file/24615287656.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf63b43a156---duwogusejimem.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7078731a---bogikanilidobibisurirazu.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b25ab67b---kefomedadimejovufafate.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/19646913773.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/df6798e82e6624b74981f3ba1bd29155/89283152101.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/749d1591b1d45a42317075cc49ca17fa/43021263731.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61236954---sibamakupexuvixin.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfad25f48d---sokunuwoteb.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f9cbe068---boputewusowojonotiri.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cbml98purlmcici1kl82nfmjq0/lebopelebe.pdf
    • http://aelma.com/sites/default/userfiles/file/45784625559.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2902dd83---48066691535.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/98e48c9777a04092ca3048beba663052/80534103711.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=7th+class+english+grammar+book+answers
    • 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_off0000e901.bin
68ace3d69bf40a6ab10343ae37aac6efdf98cb116241341bd13446287fc66106
pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 10948 bytes
font_01_sfnt_off0001024e.bin
ee246cb134618160a4ada51bdffed04dca7479161d6658b979c5cb751efcb037
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 16512 bytes
font_02_sfnt_off00012d25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 16792 bytes