Malicious PDF — malware analysis report

Static analysis result for SHA-256 990e1c76ac5dc67b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 13:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bcbc7a0c5f6d7be11058928666f630c SHA-1: 0b79488ca2f39786fea6cf3b658010fb9d2e5fff SHA-256: 990e1c76ac5dc67b77606741c14707bb86f4725bd21079d04f4cbe103d4a0d29
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://abnicum.ru/files/file/54675222175.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210806_D7E16DF613AFFCD3.pdf
    • http://haciogullari.com/depo/sayfaresim/file/kesewobib.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7ikbpjkuk0ec310pblq9m8afud/soxosirobeduvabanuzaludax.pdf
    • http://palyavalaszto.hu/teszt/upload/file/tebosiwakisomavifezin.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca0e82e3471d3f9e9558565bb9bb1824/98707921886.pdf
    • http://elanaclub.ru/userfiles/file/14667645693.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b107e891611---suxeniganigifupukotizi.pdf
    • http://tccsrl.org/userfiles/files/27716064559.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/36774201666.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/416d5ae02c8b0d25bd25f22d6925d909/lasudibewijizupanera.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6eb063a1cc786ea0654971a4214fbb2e/vazamukojeburukafezesoko.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/kovs89mpsav2o2lu2c87q30bu1/61239571465.pdf
    • http://uptownfallschurch.com/uploads/files/jatesovod.pdf
    • http://reginahajo.hu/_user/file/354992455.pdf
    • https://la-klamm.org/userfiles/file/72456904633.pdf
    • http://studiodrago.eu/userfiles/files/3417987999.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210808103828.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/16ac9377f9f0f33eed345e7c352d9b10/lufono.pdf
    • https://ijpdua.com/contents//files/nogax.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091911507076.pdf
    • http://atol-res.pl/uploads/file/51372781620.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kag2kjke6gtk8alt2qv33q12d3/25452364449.pdf
    • https://yptea.com/data/fckeditor/files/71843723552.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+in+one+english+class+10+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_off0000e4db.bin
a675a18fce9fc95d98d3dc71d4a2cb0714d3fc381cc82b5fbff55e8afb08558e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 17396 bytes
font_01_sfnt_off0001124a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
font_02_sfnt_off00012a61.bin
cc7f1e0d8d29a9cbc2689e995a736412901f56ace2ff4497be6f16372a4896fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 10856 bytes