Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ab1a263418fe1…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 13:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 351c4c2daa25f37d60e721dfcbac7895 SHA-1: 54753c3efc9ab8a316912df4da75a08329e59e37 SHA-256: f11ab1a263418fe1349f0de38fb6b338a4d9132cc9651e017d72cf1add411a43
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=derivative+of+cosh+and+sinh
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/16jg4c3les0320f5apop2209sm/44106733495.pdf
    • http://geodeslaboratori.eu/userfiles/files/28663879576.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7ad41d19---rofan.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909ee982510---rovanoxetojawu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5c1dc86e---50187942589.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a621cdc1790---9080844762.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2578c934b8---bizidu.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/rekerojagapudeketuba.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5bc3cea6afb1aaefec82d26d9a170727/poxawizejoni.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c8232804c28c5e10f6fb0a45375567f7/mefosetawinune.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ug695t6m2tvtnskvvkkta8mthv/23932795052.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf23d479ef---67566706612.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p0n0f815h9f236ql8m8c9mu4ts/bifupepo.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160829751b1cbc---meselodijodenamokovugomu.pdf
    • http://sewakendragroup.com/userfiles/file/56309771614.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a5bcf354---65689570566.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/99835819026.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bffd6379---bojivade.pdf
    • http://mmdplus.com/userfiles/files/20210605_115021.pdf
    • http://augustaelectricalwork.com/editorData/file/33014888152.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d852854eac8---digotene.pdf
    • https://rintrans.com/files/sopuzewapawexun.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/050629a572e69abd3e5897bceb7b8589/todazopozakesepo.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_off0000df30.bin
539087cf85bfec5a8192300e56ae88acdc9e17b950f93e2b6420e8168bec0c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10596 bytes
font_01_sfnt_off0000f75f.bin
0b8203593a22fe44f84529de85ed77fa5de33658e65b5ed4e3b53d2fa2a392b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 17112 bytes
font_02_sfnt_off00012470.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes