Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfc755ba1369796…

MALICIOUS

PDF

130.0 KB Created: 2021-07-09 04:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df6dc42963334d173126652e10fcffde SHA-1: 40424920a6f0966a2e4efdff97372227c8ef3d5f SHA-256: ddfc755ba1369796d53b86ebc747879d9f66879afef7dba8bdd94e3079ac5270
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70a2b8477---65783797379.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f2d5fe08---80537423253.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c54c77820ae655a6d9cd3f084c8416e5/devabozidokozawunekileri.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ed7b2c94---69940193472.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072065b17b73---sasiliwilabirujis.pdf
    • http://isdoor.ru/uploads/files/28312308092.pdf
    • http://usaoxin.com/userfiles/2021-6/file/wakuzidanamanemekawivir.pdf
    • http://www.aluvascientific.com/UserFiles/file/jalawogenitutufopafe.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2f282434a3e52b11a621241e71b03200/dapojudesuven.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/17bn87n81jra6kh0qkbccdm7v3/jiluvijozijeno.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fb23112e---46762809768.pdf
    • https://rowadalbyt.com/userfiles/files/bodanonobadibi.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2067560f6---nulagizaduj.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/26998db22fbb1675378d8f9376686558/9341730670.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f8826b836cc45e43c4a44e1cd2aa464/jafume.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u8rbcd0om22ma8ae1oolqt99lc/86116514591.pdf
    • http://bright-mineral.com/uploadfile/file/2021061721481812.pdf
    • http://ausafe.net/images/art/files/90193184416.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9716ec25---41680232975.pdf
    • http://wannawwannie.pl/userfiles/file/kalejilegagiwodekivazuten.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebbc2e5ab---sevupugifaxitoz.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/c34de3d44mfjrnf5ursq5ua799/sujur.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c24b967f9---xonesurewawesejufopadiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=adversity+and+resilience
    • 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_off00019a75.bin
7eb248eb1b18ef221f7e86d6e8dec693ae43fd8d81d443c5875aa2066e1dac11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A75 10404 bytes
font_01_sfnt_off0001b22c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B22C 16792 bytes
font_02_sfnt_off0001ca3e.bin
d39958c23431c463a831c4c8bd4e29ce889c34a2481bea8d83ea401690c548a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA3E 18824 bytes

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