Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab39a6119ace2777…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 00:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b6b903ec1875444a5eafb6046ed5012 SHA-1: 50d6f6d54bd7760f3c9ebf02931631c6e877a13b SHA-256: ab39a6119ace2777471096d06de2694c3a1a74f21502b606c88231994f07f987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to phishing sites or further malware downloads, aiming to deceive the user into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=important+time+for+phd+students+crossword
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3cc946cb57a862b37adcf0f6aedd2724/dosikevarajigukasesapale.pdf
    • https://al-farh-iq.com/upload/userfiles/file/jejasojamab.pdf
    • http://piazzademarini3ge.com/userfiles/files/95973891128.pdf
    • http://ranaghatpchsschool.org/userfiles/file/27089448294.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088527342fb7---barexof.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/68c12b6b35d1667e988d1154a2c39527/78197804798.pdf
    • http://stpatricksreunion.com/clients/84553/File/jibawidavive.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3b7ca3f3bc64d1f1826b396b3160cabf/sarazer.pdf
    • http://geyikkimya.com/userfiles/upload/file/24697042399.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb02bb1da---zudevatorijigexajed.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/pudagezalemajiluzu.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xuxepijisosopuv.pdf
    • https://sasalidayanisma.org/uploads/file/lotefobiduwavirosa.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a6ecd9b75a75fe58a5ecf66f09440637/31015643573.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d4d9c9782b90b20c3241384112716b05/wararoxozesosivo.pdf
    • http://dlt-nkp.com/fileupload//file/83609238845.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1ade543a3295e1e2b69756e9e86cdf5f/nekojexubafazizupuves.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/2rb6njlke0n9n9btv7nu9khvgb/16441303707.pdf
    • https://werbemittelag.ch/upload/file/kaxije.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/27354298000.pdf
    • https://angkalaris.com/contents//files/49745220735.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1e68f110f98362a3de85c94174e737ce/genatomugavabilonofelaliw.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bd1cb9d8bab600b00cd7f8e2484477d0/71710746020.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_off0000f6e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 16792 bytes
font_01_sfnt_off00010efb.bin
dd79e50eb00b6daa0001e8f1ea9a5ccb61cf6f2313e60d754759dd5fac4be345
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 17440 bytes
font_02_sfnt_off00013c65.bin
720e8567400a090e95facf107a8dd8fa24bea048da641339f4213bf93afb2fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 10976 bytes