Malicious PDF — malware analysis report

Static analysis result for SHA-256 0985f751dd500ce9…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 02:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d99cdfc724a8061accf91b2395bc39f8 SHA-1: 80a083fc7863f15214c123512dddc2cbcd2a20fd SHA-256: 0985f751dd500ce93eee49fe47904044891ffa5c7e9e207885c67c8a88446f18
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or 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 0.9822

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/aqo11rlcev9n3or5ib2f515p9k/jokitosipasevizepisev.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/tumubojefobi.pdf
    • https://lapiadinafelice.it/file/tazamavadufapuj.pdf
    • http://wsp.pl/userfiles/file/lazisiralabadimipenofa.pdf
    • https://xuantruongtech.com/images/ckeditor/files/71097091962.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609216008c44d---30915388652.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc46235b75---31034903941.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0f720685843555179cfa7dac84c63cc1/16238319072.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bc065qoi857sgouojodiqr2197/29023101598.pdf
    • https://gangnampools.com/contents//files/kokosu.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1df016d5893b1d5266d0775d1e92439b/32529596006.pdf
    • http://anhbanglaw.com/userfiles/file/zenaxe.pdf
    • https://peterdegendt.be/file/runajuzukojifikajo.pdf
    • http://valeneighbors.com/userimages/39956073278.pdf
    • http://memphiscentral1969.com/clients/865565/File/dufuxipugakujaki.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e45d4e37b86561a5e33341569cb0a61d/livusisener.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/95c27546ebfd93a8b042eb5b54e54603/kifiwabimikopenuranipafu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/548f343ffa8a2278c840e228dcd31575/27077214237.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofatelojonate.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1a4560316566bb96d1f758b065ad7397/58428928661.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/297234449d1ebd499ee16033057f5bec/dujazofazedukuroro.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6f24e0a8---58202511954.pdf
    • http://alimentosldm.com/userfiles/file/jufevuvinemiwefozan.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vj8ansuo5bmtaf0fi6agp6gv3/fisawabikinumekina.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/88556612279.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d7a9f4381f51389b9a8f54f59d3095ba/26785109435.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9b77efe3---97261475949.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+lamb+and+the+slaughter
    • 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_off0000f79e.bin
94aabb2f7471f0ffe39e4bb1f3c1e62481ee6d4504dd0bb138724b6deaff40b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10688 bytes
font_01_sfnt_off00010fb3.bin
6560d2a1bcf98931e6a899c7631600aa2e51117d9f5607e51a3e6b90f35ad391
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 17532 bytes
font_02_sfnt_off00013d39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 16792 bytes