Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd12a5eff61caa67…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 20:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6143a7ceed33c0d93eb26b4121abdf6c SHA-1: 46291a9bf3c664d455d1832d4f220d66bce13ba0 SHA-256: cd12a5eff61caa67fbeb6cf45e93cd2ee1ef066982ef8b018ab38fe5266cbf70
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://weddingceremoniesbybev.com/clients/72651/File/25716497798.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4937ef731---1322916930.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e1e52c91---robuvufosifu.pdf
    • https://heritagecambodiatravel.com/userfiles/file/poledesisigexebib.pdf
    • http://dajuicebarus.com/uploads/files/filuzeduwor.pdf
    • http://year-c.com/upload_fck/file/2021-6-19/20210619080155926986.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r3b6d8b5f5sf8l7m6p5kr7bd08/69996173278.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a944d7614cd---lariwiguturorubuzazefen.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/sosatirike.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utiqkjoc15f8as9q98lsl8g5j2/barinabaxixosokamunisa.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/ziperadalazenovuzagif.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b165b06d9b---40014544206.pdf
    • https://asthasupermarket.com/userfiles/file/fulowezepebetazafufoxur.pdf
    • http://slstudio.it/userfiles/files/nuleguduxubutodalawep.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff48ca243---80026132168.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/karorogepawa.pdf
    • http://pnmanagementsolutions.in/uploads/11265371414.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88ad28d2e---64602467371.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/37715664731.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb2142420---96198476516.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3760e561dddaf75ef6baea0801d696b7/4496385421.pdf
    • http://congtydaihai.com/upload/files/guketavowirila.pdf
    • http://apcmagon.com/userfiles/47104873395.pdf
    • http://aaaexpressac.com/userfiles/file/17719866992.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35bf2909a---devupuwefevabaw.pdf
    • http://baaningdoi.com/file_media/file_image/file/tebogop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=story+of+season+trio+of+town+guide
    • 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_off0000e9c9.bin
694d562dbeb796d46a4fca9ee73152887e3f144d3668d4d3efdaf6daf1c2486d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10856 bytes
font_01_sfnt_off000102db.bin
4dd1a50a71d5172f2fc610c8843a25437ec92a74b8fdbfe45bf27cfd9b60da52
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 17436 bytes
font_02_sfnt_off00013043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 16792 bytes