Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a36f5e3766df68f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 02:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 363f51d6ac2577235c17c330ef748a47 SHA-1: 38b22871e78b4a84e2b288aa871c319df35902b8 SHA-256: 0a36f5e3766df68f2a18894f433bd37747b5d898877b058a7e9600b0bab1ac85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. While no executable scripts were extracted, the structure suggests an attempt to lure users to external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://egyptlance.com/userfiles/file/54762276420.pdf In PDF document text
    • http://christ-china.com/filespath/files/20210904000350.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/monifuronubakad.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xodes.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/12303685178.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/nebutel.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fesupiweletasedulolad.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/darixuzukorupete.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/19981660371.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/4069379463.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c10ff1c22---mijijefa.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xasifadip.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7fca0a09---kanezagonedufewu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd76c0fe32---83774026163.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/radabo.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/zutexubevala.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bevidoxaxi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/bufibezoturitefuw.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/waxojaxiwibaxeremepenig.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/8816295114.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d7c12de---95887300367.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/6758240797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=friday+13+apkPDF link annotation
    • 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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 10124 bytes
SHA-256: 90b1eb465c029f984a72f2534e52bc4c2820b9357c92b66c8bd4671481a263e2
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 18660 bytes
SHA-256: ffffd98b61d96fa4f88ab605da75e8a584b66f4d8091d8415301c08dfa808d0e
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1