Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b516583b10b04f…

MALICIOUS

PDF

93.8 KB Created: 2021-07-16 12:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c912169cd043fd50f9a1c360cf658e8d SHA-1: 4f4f0b39c731dcf9e88e552b2a11c8dcdcc784d0 SHA-256: a2b516583b10b04f05e2f29c5b4f4c6b928e8dd5ed60d8774b8cfb0c2a7a4a87
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hgk4ijbgv960ap8t9qfhdg5at3/janajobenojazux.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/gasagolitogogorafatitup.pdf
    • https://kovtec.pl/eurostyl/photos/file/68782837946.pdf
    • https://calmoinc.com/upload/editor/file/kunamawetoguraxufenipupo.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080197e43bec---27960463417.pdf
    • https://promise-land.com/upload/file/76211965087.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb50a4c883---99125447908.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b11c0aeb---dikosatugizozegumajedil.pdf
    • http://sakuragiramenandsushi.com/uploads/files/19877738712.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/11a93d50c26f2312894d17e65bcd5031/jeripe.pdf
    • http://asesorgubernamental.com/images/file/72853501368.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/69e3fd1cc37ad1dd6046f5cd114e479d/63873423781.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b0ecbbfa7dff34b929de0667087907bb/66113516014.pdf
    • http://asustainable.com/global/file/15222364571.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vvqfm6r8nmjqgrhaf2o8ufpmcs/kosawalix.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/raxofipivawuxerusos.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10436ee84---lesapawelewikeboso.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b624e93909---83132961096.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tm22pp9d5v5uq2smmmsbv8qrc7/nudujufusulufezup.pdf
    • http://arredamentoambienti.it/img/file/70134154679.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/46523847381.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/4p2a116nckmngh11ffjl0km85b/9932594742.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=interview+questions+and+answers+examples+for+teachers
    • 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_off000109fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16792 bytes
font_01_sfnt_off00012210.bin
39a4f59b98d31d3a7a6a528f352197f8e35af1a72144852e4229d10124cf65e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 17360 bytes
font_02_sfnt_off00014f85.bin
6cac6fa22c245d9f9cd84d8d4bbcd1a469489c66453edd1773725cf8ece14cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 11336 bytes