Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ecfe6695d57b5c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 21:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977fa0ef76e4370aa95b6a7767cf247b SHA-1: f04e5b2d3b6a3d10410fbae577c4e5dd49cab4db SHA-256: 48ecfe6695d57b5c77573b91fa3cbeb5f79e7f83980e89b8ee250a454de020f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://adminico.nl/userfiles/file/41812522558.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f71a2a4855---97670474178.pdf
    • http://www.kingsmen-cmti.com/upload/files/wotujidik.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/tokavawes.pdf
    • http://usairsprings.com/userfiles/file/dilotogopukusafijov.pdf
    • https://leanuslab.com/UserFiles/file/jomat.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b67ae8ee64d00a39f042c62ef71091f/11034014962.pdf
    • https://swalaya.in/userfiles/file/sorikopodefodiforakesuv.pdf
    • https://dnmpaint.com/sdcc/images/file/jasitejosobabe.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a41f689e1---tikoketesagovesijodigib.pdf
    • https://cissud.it/uploads/ck_editor/files/92851409699.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e13jbc8e936bc5t7e3fqcuqn79/jokekefewa.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/zakoredada.pdf
    • http://olynskiconstruction.com/pics/file/nirodaxogew.pdf
    • http://giga.sk/storage/file/24026063165.pdf
    • https://cailux.lu/userfiles/files/23069240798.pdf
    • https://eletvital.hu/uploads/files/68537308041.pdf
    • http://veewood.com/file_media/file_image/file/45872529700.pdf
    • https://chupwo.com/editor_upload/file/nibajarod.pdf
    • https://reitinguok.lt/userfiles/file/33266397905.pdf
    • https://laflammerouge.ch/userfiles/files/69962812314.pdf
    • https://er-cardiff.com/eurostyl/photos/file/tarunarivuzusu.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l60j4nc9olo16ekb13l3kh7taf/11766280280.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=steam+streaming+android
    • 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_off0000b532.bin
1a9ea5cf3148171c639a5e7f5cdc3fc5957f747824e7d5f9afb26af86eccb99d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB532 10620 bytes
font_01_sfnt_off0000cd34.bin
960598acf6e6295b1e77e156aa2dad73a2acfc067e6eca7ed1858c028e16dedd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 16896 bytes
font_02_sfnt_off0000f824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes