Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a83e7bfe7429b3…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 00:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62e6778237b87db4830ccd69a1d9df42 SHA-1: 5b1aab25cb1b848bc98c764f39a231b055eaac14 SHA-256: 55a83e7bfe7429b348d4b897b986eb28929cece53bf758ae6d7a1e8a8c2cf4b3
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://crewmak.ru/uplcv?utm_term=the+alchemy+of+finance+reading+the+mind+of+the+market+pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6ea94b7b---18330992147.pdf
    • https://musikkursus.dk/userfiles/file/pukubuwiz.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8260b6604---fopetavozif.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/g9li3uq929ufac1rlodo11fvvu/56666185540.pdf
    • http://ajivikafinance.com/userfiles/file/wanetujadefu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ee11be86---pafetofipukowijige.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c47332cd---8104511966.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab47bb8f6b5---59337134081.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5ba75c10---jesuzego.pdf
    • https://okud-istra.hr/userfiles/file/1179601249.pdf
    • http://allprintusa.com/admin/images/file/dixizudevosimuvojidiposop.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab470511e---xomejalagabawezuk.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/nelarupakibimipepod.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/wogimisanu.pdf
    • https://pezenasenchantee.fr/userfiles/file/7562843724.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85cb48f24---notazosewav.pdf
    • http://bagliodeimille.it/userfiles/files/89471553948.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/11ea5538d1f040762d75178341804ca3/pitulapux.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072164dedc48---10757087323.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/3juh429cbiqa2e83b0s3s16sfg/pixiboj.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c7e7d1b66050e8fa0945a1fe74c57993/gasulatimix.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/air9o5299ppgk4b7ptam96j8j5/28374443956.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5918401e0217a6c69d78cc42930bee1a/tulufoguvepisetivilin.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/gidoxoxazoredabezabegegob.pdf
    • 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_off0000df9c.bin
02c91e4601530bac209501f6c545641521d9db50c629712151d42f4644c58f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 11068 bytes
font_01_sfnt_off0000f903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16792 bytes
font_02_sfnt_off00011115.bin
5102a86271646d24649797edd7ded25f1e0ec1ef0ebdc76d13601ee5a8b9fb87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 20656 bytes