Malicious PDF — malware analysis report

Static analysis result for SHA-256 61783db9241604fc…

MALICIOUS

PDF

85.4 KB Created: 2021-07-14 04:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d2d8b13edbde64091f18ad5f491e814 SHA-1: a88c1128cf92d77e6246f1c7bb407a8598e2d553 SHA-256: 61783db9241604fc0e014796dfdc877843c50609ebad6fd402a2c513fb074ba2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rivnerun.club/images/files/41059955323.pdf
    • https://uleiuri.ro/userfiles/file/rigubimomejegezidasepikag.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948bb8712a2---87045971100.pdf
    • http://pogservice.ru/userfiles/file/7676487534.pdf
    • http://gamax-motor.cz/data/dokumenty/22066838929.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c28875299---nuwetozapedubek.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e7aecde67---73652044594.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/80a68976ae8f164e515fb76f267fd485/18470211921.pdf
    • http://dyglas.com/userData/board/file/gofesewumajemilimes.pdf
    • http://allaboutdowney.com/userimages/25588019877.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b98b50f07---75503968675.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/46672308719dbc7d3637d6a234d45bed/96961558979.pdf
    • https://agentcctv.com/userfiles/file/wobatukivu.pdf
    • http://asja-doll.ru/userfiles/file/54172704342.pdf
    • https://lacecinella.com/writable/public/userfiles/file/sesimaro.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7ssk2p8ld58lppdh93gaqvodh/23015815961.pdf
    • https://x-software.cz/data/file/46471261695.pdf
    • https://okazdedziecko.pl/_files/Media/file/63597430825.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/959446e2dbdd3b4922a821391aab4d37/28859163440.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/fapezozebikuped.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf3b7081d---77771557353.pdf
    • http://ever-pioneer.com/upload/files/lusawatajezavikate.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/379c035ffd299c4b998d262cc360ebf5/faxifopimurakukomuru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+does+ops+mean
    • 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_off0000e98c.bin
5aece7bf868cf35f93ddf7b0f5323d78da1a9cdaa5d33cfcc11418754ea43164
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 17948 bytes
font_01_sfnt_off000118e4.bin
b4095341dade0f5a408efac6e15896574442a54a0d432cf5570768bc8b6c7b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 10412 bytes
font_02_sfnt_off00013052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16792 bytes