Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58ae4296f71174f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 10:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bb3e3dcc7329d6480195b3d065c3616 SHA-1: 9c27984dc74b0cca3b01d4c6cc72840dd331fa50 SHA-256: f58ae4296f71174fe14ff76f58ae158bd4c7fd4c9af0f3b3fe5b0c90fb11bc6c
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. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. These links are likely intended to lead users to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/m6rl2jr0i712qbbj50i71gffi7/fabuzogamogikizuko.pdf
    • https://ozmutludokum.com/userfiles/file/44328696634.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8vbumg3o5pifea4nmlmvv775b7/20202667730.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/38300844428.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926e32b7bf---74468883582.pdf
    • http://brenno-tojestto.pl/userfiles/file/mopobitop.pdf
    • http://goteneplast.se/files/images/file/patine.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a94bd4d9a---50548928718.pdf
    • http://adance0112.com/upfile/editor/file/43203505130.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b80d3a9c---72604647601.pdf
    • https://wegofa.com/userfiles/file/gudanalujitunevanafojejez.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed4516efac3dd9b949840d05b1167de0/78906023894.pdf
    • http://cpghollywood.com/userfiles/files/22521899207.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/93fbb1c9b0b784d1eefaaaf376d3daea/limir.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1ec7f3dcabab5a26fd7cff1ea435521/boladivaponasabobi.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608206ce52ee5---fukogizuvusaresi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/84nnud6kpinpt4je8f2vnjman1/97061387019.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/nadeledopovijikan.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29154e6b5a---jefusunizisowu.pdf
    • http://freeski.hu/freeski/file/10382399337.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7bd0faf71e91563e467ea22735897ed3/39969320332.pdf
    • https://clearpatth.com/userfiles/file/81892591428.pdf
    • http://trendymamy.pl/userfiles/file/tadudefigimomipejumo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+german+silver+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_off0000ef8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
font_01_sfnt_off000107a5.bin
c4b3999f177851e0377d427d2c6b5b1d830ba91c84b0dfe54c1e832d49ab3d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10752 bytes
font_02_sfnt_off00011ff7.bin
e745abab7a5aadff0a72ea7fd68452c86ef237a654d8f472326d089cf1884891
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 18548 bytes