Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8ccff9822e6b50…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 21:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67334145499bed2d767348a812c5014f SHA-1: da6d1fbcb949c121f506e1382ef8b0e68b7f9bbb SHA-256: 5c8ccff9822e6b50422d4c61e7cb8f8cc009a8e640abc0e29decf53300b18a42
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=process+of+soil+formation+pdf PDF link annotation
    • http://aucoindeshalles.com/menu/file/tatarikeron.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3b6536e558da397ff995225c9ea5c8fe/86898736315.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833910ae1c9---99777336742.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/4494768412.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/rozedudukowirokul.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/wafikitesozenurokog.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/fapiwewuxopogopazaxemekop.pdfIn PDF document text
    • https://ms01bet.com/contents//files/85445613314.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/52458947846.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210706074526_pdielk.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe8c067c45---97388182276.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/guveved.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/59885161091.pdfIn PDF document text
    • https://triosms.com/userfiles/file/25954692504.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fff5640c6e7ab49c638404bd5cc25fc6/12309375843.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97488a33b---100340812.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094316c0c3a0---84031678504.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gavajedanilima.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021082919451983.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/winafudulexatal.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/33167529687.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/26613438056.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 10780 bytes
SHA-256: bfd7b25a7d1a8a30ea01029d565633a997c9203f04ebb10ae879da63c05acb6a
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16264 bytes
SHA-256: 3151e35be80de56f1133a37a5444b37784185348243ac983d9fcccdc52326d20