Malicious PDF — malware analysis report

Static analysis result for SHA-256 32837b82b3722ac9…

MALICIOUS

PDF

87.5 KB Created: 2021-07-29 13:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 236c05c8289a03be62c9de91c123d0ff SHA-1: b59fe4923a8c91900a5b7bc26bdcc6a4e468d0b1 SHA-256: 32837b82b3722ac9e17625a4fe619a866b40fdf769cf33baf310c5dee9d865b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--tnqz8hz5cb8l.com/upload/files/voledokesirowafasoz.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609088291afc6---24075950024.pdf
    • http://absigorta.com/E/file/zomugum.pdf
    • https://harkakotony.hu/UserFiles/file/wovolijitejetukeko.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f04c6e4c---4805290052.pdf
    • http://www.hydro-tg.pro/upload/file/53049068229.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d8864809036---sosesopoju.pdf
    • http://isosklo.cz/uploads/19672211482.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cbad936a---63901952370.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a42bf3b18---sakovubax.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4760e94dbc64a1d96195a87819a4c011/13796165585.pdf
    • http://perles-del-beya.com/userfiles/file/lutizadabazu.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2e757fc0201bf50fc499cc5cab656eab/97875809125.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3518d0b0---47780984421.pdf
    • https://motiwalainstitutes.org/userfiles/file/zuvasiwexi.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/63221428514.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/734f06332e092e0e5bdf6c7692ec0d52/radorunexoxodaj.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/sawekirowo.pdf
    • http://incucinaconalberta.com/userfiles/files/17035106575.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e11a578ac---wikunubu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076c33e6d7fe---bapudaritewera.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/mupojogedofamejukelomudar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bissell+proheat+2x+revolution+pet+pro+2283+manual
    • 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_off0000eeb1.bin
770a7097415eea589df23f650ae87365db02515be8563a1e7097186704d348a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 17288 bytes
font_01_sfnt_off00011bf2.bin
7a470689e2989e92cdd49c05c19f767f97fef6c4c279a4a6077767c49d5d23b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 11336 bytes
font_02_sfnt_off00013690.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes