Malicious PDF — malware analysis report

Static analysis result for SHA-256 0525c4d32b815049…

MALICIOUS

PDF

99.2 KB Created: 2021-07-05 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b4bcddd4436f7db3ecceaeabc9fdee7 SHA-1: 6f259807cec5802cb83686bca1d060359f475e0d SHA-256: 0525c4d32b815049b01887ff128c52c62ca4e24a5143ca718f71bab872382617
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63d6a337---mepam.pdf
    • http://jandebruijn.com/uploadimages/files/67786348576.pdf
    • http://iberia-ex.com/images/blog//file/81103554661.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c332ej8epf9d0prk5p1uqmcqb2/9391197091.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecd85f50---18049407984.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b429aa8ba---15854634289.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/46315521372.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f56e49c91---99299970776.pdf
    • http://absolutelyneon.com/userfiles/file/juzifipor.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3070595a3d6cbc5c596746212b36b838/8982340521.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1549a56202d31503f83530ec22323ce8/20282945786.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1c65c3bf5ab57d6475188dabc646ad9b/29731008607.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd567de78ef---52944193233.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/semes.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/wowojaget.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa25bcd1e---vovonubidiwix.pdf
    • http://skolicka.eu/foto/images/file/puxugarizuzifopo.pdf
    • http://geose.ru/userfiles/file/memixamuxiwaxexerizapo.pdf
    • http://studiogiamberardino.it/userfiles/files/81546820793.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cc2f309c4aa38ad89e26b1d484b3f229/lolisomowidumepesekus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+penguins+in+a+christmas+caper
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010212.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16092 bytes
font_01_sfnt_off0001174e.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 1700 bytes
font_02_sfnt_off00011f61.bin
743ba3b8bbec23ce387a5875e5a5db224b786c9a4c41eb2ded20e0208ea4eda6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 18504 bytes
font_03_sfnt_off00014e67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E67 16792 bytes
font_04_sfnt_off0001667e.bin
afea057e2cf6986e2491208dc7106516d7ea08d2e1c052be7ee9857a7688c933
pdf-font-stream PDF embedded font (sfnt) at offset 0x1667E 10720 bytes