Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe8780c7899d387…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 17:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0420e9737f18dc5f086aebf3259e6601 SHA-1: 983634760998cf6f7a1da609439917a0eb4bad76 SHA-256: fbe8780c7899d38777c8b3ebc21e8138d4912f136f5fd86396f99510198efc10
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laflammerouge.ch/userfiles/files/sivowogidunusumekiwipa.pdf
    • https://laplacedesstores.com/upload/file/walaxonapes.pdf
    • http://tingchucontrol.com/Uploadfiles/files/tukinoroto.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/de46f076ef4ab209d2cc4795ad23d688/25511944710.pdf
    • http://pamat.ro/UserFiles/file/lazatenin.pdf
    • https://jewfri.kr/files/image/files/69814563810.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a3d676023ab33b81829a8f6d6d30aa84/72543559997.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/buratepisonixujalewam.pdf
    • http://kamerton.nl/clientfiles/15315152154.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c9b7d5a---bowobivijoleni.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699410a0af---65764296214.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1c8ba0e0---zufalidata.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/baboxexowaxogolawel.pdf
    • http://tfforming.ru/d/files/dodivopa.pdf
    • http://gostinica-domodedovo.ru/files/pilabemizulafirule.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef193ecae---sojanip.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/53317772838.pdf
    • http://aedelsur.com/contenido/files/nupipenibedesukok.pdf
    • https://basisangka.com/contents//files/dokolimipeto.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/00k5jbq4mirufqn687tva41slc/baronisewefiti.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcef3f4ba---54500297882.pdf
    • http://ersatzmonitor.de/userfiles/file/27580235089.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1babb24209b5ee184f6ca1c72fd6fb2b/vavomexufefalaxexibobub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=common+application+of+computer+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_off0000d7a4.bin
bdbebe9f6ffeab8b5319a82c7a20b4e83621ffb7887117e0d455b3d0620b0e59
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 10744 bytes
font_01_sfnt_off0000f051.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 16792 bytes
font_02_sfnt_off00010863.bin
1946e9376958b3a04f08ce0f590cc895fce43f5b0a60a274b532a97274ad5e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 17488 bytes