Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b2ea4b2f4b636d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 05:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44762d43b74374709bc121fa1f9660a2 SHA-1: 0c17abe6f1de4f7c912a2c09b890ab006c96bef5 SHA-256: e9b2ea4b2f4b636d074d857be194f28bcbe47f6f1ee315a1ca010e35033d9228
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest the PDF contains a link farm pointing to compromised WordPress sites and potentially disposable hosting, a common tactic for distributing malware or phishing content. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document is designed to trick users into calling a phone number, characteristic of callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9p35t4uhu3ototlo0dss9k202p/koniwadezimapiwiras.pdf
    • http://jevades.com/aircraft/fckimages/file/bemozonuj.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d18542713bc---44080277.pdf
    • http://polins.org/public/userfiles/file/welebe.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e17d1a56---telemisesebijuzoweten.pdf
    • https://grupahatak.pl/admin/_fck_files/file/navevozifunugozoxipudas.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/14066323429.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a23297e50c94ca96dc503e4de4eee41/titobuvedopukugaxopar.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/xemitutazejevujudofadoten.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/67755245566.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e6ab436ed8117563ba91e9c117558b64/25250716669.pdf
    • https://bak.vn/upload/files/pasodikonamika.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/11434417995.pdf
    • https://cowichanmusicfestival.com/userfiles/file/murefujukixilagoguxafu.pdf
    • http://bjbtrh.com/files/pic/file/26823479532.pdf
    • http://tupnate.com/ckfinder/userfiles/files/62948876461.pdf
    • http://erdivigado.hu/userkepek/file/nasotumorafewukawis.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b329a4965---78080633253.pdf
    • https://yukkumpulgroup1.com/contents//files/73534691475.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rbmm98kgpdhmo09j4jhibq5j50/vifanipuladobokame.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/27d9c66f3dc44da4434598b1094313cc/merabagoguvitogevano.pdf
    • http://archi1919.com/smlclub-files/file/dujajezojasopevosekul.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b1e696e053e64178d93861f539cf6ae7/49230474610.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2bd9a79080a7de4110cd2dd3e3f4992/96212903610.pdf
    • http://tranhdaquydep.vn/upload/files/tobiwaginelemosinobij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=libro+el+jugador+fiodor+dostoievski+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_off0000db24.bin
01d1449b3a15396a80fa6d39a7bc699eb861c8ff080ef4abe3454e6e7a3a6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 11056 bytes
font_01_sfnt_off0000f498.bin
361bd9bfa54acb7ec1e3ef36600b96bad140425a0d4f6d131ea823f7731799d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 19988 bytes
font_02_sfnt_off000127cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 16792 bytes