Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb4b0c9fed966ec…

MALICIOUS

PDF

138.7 KB Created: 2021-06-30 05:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d078ff2fc892a89359e90442a3089cd8 SHA-1: cb3f087ddb6a6413d368b3a4ad3afd417fb9fc6a SHA-256: cdb4b0c9fed966ecd73ea7aece2bdbc74816e4ff714d06271c56c47fdd082ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting other malicious PDFs. The primary intent appears to be directing users to these compromised sites, likely for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a651a6c7d08---pejuzafuju.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c2trhcc93i0tq6qpia17cgilp0/xemokiwabadifa.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/28cf8b3163b273c87e6dec88060e6fb3/diripak.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d036f3084cf---wikirefumogovabi.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0e2765ada093dbfcecb2f21d5537b86c/kinibelovexukesawe.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e1521c1b8---5587483810.pdf
    • http://pk-kuepfer.ch/ckfinder/userfiles/files/44709647049.pdf
    • http://piazzademarini3ge.com/userfiles/files/kivijaresaxixowet.pdf
    • https://ltssinternational.com/res/wysiwyg/file/38209562077.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aidn1ihvnm01p6imjjudv2q345/83458269391.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d97cae9a---33702201188.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e5cja73jtsdocba3kb61es3ce7/58011018693.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3de864ef44---faxewavigoxege.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/iughm71frdj887dp5qmicrec76/zomudikoxuvaraxowetinera.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160915fd483beb---vilavixenilelani.pdf
    • http://zrdb-drogbud.pl/Upload/file/38741853982.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaaee5daa0---51672445.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f165ec2aada54e1517eab80fe9e87915/tabofan.pdf
    • https://seitonsolutions.com/ci/files/27225387655.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/49263593937.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h4hbp43avlqtckvv0fmap8r15r/51354065107.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7196042---bawinedanosorizoke.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8017b05228---volabimokefunigedex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=i+know+that+girl+mofo
    • 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_off0001c2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F2 16792 bytes
font_01_sfnt_off0001db04.bin
6eed646f98d00063f3e5c9cac685255794ad003fe4316cb03af1b31dded679ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB04 16692 bytes
font_02_sfnt_off000205ed.bin
f708f7933e8a8a72fadf873c4f88314d8c9589a6b83139ab35b26d7ad0621d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x205ED 10492 bytes

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