Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb03d6b2843191a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31a9738b5a99ec81143e74c6c37b7646 SHA-1: bc1b0b40be2f56faaf50c079b3593b0ba3ff34e4 SHA-256: 7bb03d6b2843191a464613f392f5f22654a1ee88fe0dc6efd21a32f7881a016f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various websites. Some of these sites are flagged as compromised CMS uploads or use disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://farashimirooz.com/files/fewomasusidefivi.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/62786024588.pdf
    • http://seasplendorpetro.com/userfiles/8467724477.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dijixudibimezaxakitogaled.pdf
    • http://rebizplus.com/userfiles/file/66028146133.pdf
    • http://fiumaradelsossio.it/userfiles/files/54407974702.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e33b8463e9e66963e86349c2455f47c/41933721085.pdf
    • https://mcsfood.com/images/file/saruzabufebiroxe.pdf
    • http://bsbcarpet.com/userfiles/file/47195176035.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403205430d7---35361430332.pdf
    • http://travellightnepal.com/userfiles/file/42830348300.pdf
    • http://asijskepotraviny.cz/files/file/jezudefixonosutun.pdf
    • http://yuanyoujie.vip/userfiles/file/68834953401.pdf
    • http://asijskepotraviny.cz/files/file/javupulodabi.pdf
    • https://ladangmimpi2.com/contents/files/75253329620.pdf
    • http://petukmahaaaraj.com/userfiles/file/24566280210.pdf
    • https://gastriklandsbf.se/UserFiles/files/72316620349.pdf
    • https://ntct.dz/ckfinder/userfiles/files/pufafexisal.pdf
    • https://lienlacanien.com/img_pages/file/65977190953.pdf
    • http://unionnutritech.com/upload/files/96697606308.pdf
    • https://bold-iot.com/uploads/files/202109091250439301.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/22686296980.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd2a5574a---45289722409.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3501dd3fa---nukusefesutubowavaviwewi.pdf
    • https://ckmandarin.com/uploads/76382468640.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=browser+mi+tv+stick
    • 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_off0000b494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB494 16792 bytes
font_01_sfnt_off0000cca6.bin
86435b8f3ee16d1734c248dc67de66827a2f220518e66201279782b7abee31ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 16744 bytes
font_02_sfnt_off0000f78d.bin
5ba0f0d4ebef233928b3e8f591bd5671c1c56d1714500c63c50558f6a021128f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10376 bytes