Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b98e17ecb562743…

MALICIOUS

PDF

92.7 KB Created: 2021-07-10 09:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bc8ea511f6ae03795df1a33a560cb4c SHA-1: 35df7ccada38c05156df44a3f2fee102333efd27 SHA-256: 0b98e17ecb56274366cc5340a100ce903c15ec8b9935e5ee2b726a15aeb5f523
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=waterfalls+in+southern+nh
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/genegovas.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434be4fefc---luzolesa.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b2ad7c6d---pozabol.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/c43pkaksn42butn87bujmd6phf/xobawusekodo.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838bdd9b180---botoxometolorelupul.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4215bab7a---9169746872.pdf
    • http://meyanko.com/userfiles/file///zotesiwelisikekikoxesuw.pdf
    • https://agrilaui.com/userfiles/file/wupepetonisemilevujozeg.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/28600268787.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac896c332b---65429982760.pdf
    • https://iwanbim.com/userfiles/files/57989151991.pdf
    • http://hanleyresources.com/images/44694471455.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e8041b16d6a0e801087123b6020aa46/zibiletun.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a508b9202d---66403516306.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c478bf24265668f52fa2d8be71663c3d/48410238830.pdf
    • http://ingmontagna.com/userfiles/files/33896409787.pdf
    • https://digireg.cz/upload/xonifukovetulofobinuwowez.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2og8nb1rlt77kl3p0lqpfqebbs/9135559930.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dge0uis9f2alt4rl1ipsqjosv6/49731010833.pdf
    • http://stellamaris.cz/userfiles/22809276764.pdf
    • http://erdivigado.hu/userkepek/file/48606985860.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a95082d9f---suleliborosukuven.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_off00010618.bin
75086db537ef195653ac2b7b6361ed04b95438d2250b0941875b542d9551f647
pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 18168 bytes
font_01_sfnt_off00013649.bin
31236f9edb66574567cd52213439b1980d40446ccaa90e8baef1c4cbe7a0bdc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 10404 bytes
font_02_sfnt_off00014dcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 16792 bytes