Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7c24fdc8c62207…

MALICIOUS

PDF

103.7 KB Created: 2021-07-01 12:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35caf2099737c5a0107b0b151b8ff3eb SHA-1: 958a548dc983624ec361e98b183fe97c208abf7a SHA-256: ba7c24fdc8c6220766761695f54809c898cfdb6caab41d62ce6683751e189c7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/af923c2efe7ada81487a8c2fbb57304a/dezokesirupobug.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cd20b3ec---rodatize.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zesunurolex.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec88574f0---709879145.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda027b334---xejuk.pdf
    • http://www.moyekolodin.com/files/tedekojezoli.pdf
    • http://armanetti.com/images/murepunixige.pdf
    • http://morard-mcf.fr/data/Files/7984954164.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/04116a215c6fc16377bbc80f066d5832/26862642277.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1aab66b7b966f69ece25c73e58280978/dewapo.pdf
    • https://doctorchina168.com/upload/files/sozupugikokapujavifop.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/80emk6701pfbffj9u8fqe7rjd7/befevuxodewa.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f63a51b3b---66284744258.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/03scv7h0k7taaqofor7hbi38rn/13799591068.pdf
    • http://amoy-art.com/Upload/file/38904604775.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f358975eab---nejufilakadakesixaro.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7886ecb53b---terasumovetalatadenit.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/94235de0892ff2e71a1e9cbea4cf6803/81564157447.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c71063b936b---73257967083.pdf
    • http://backkwang.com/userData/board/file/voseradegarefevekatib.pdf
    • https://andana.us/files/files/sosobaxezedororuz.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d123015e89621adef74e0c485218062/1364937399.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+meaning+of+fewer
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000162cd.bin
8cf4d0ee16544b44512912113a48986fd5ae9f4ceb8836983fc9db2eec41060b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x162CD 25136 bytes
font_00_sfnt_off0000f5f6.bin
0d29b5512854277f14e3cc976e44a0f94cbd983a3e0d2f3407a040dc1dece5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 20124 bytes
font_01_sfnt_off00012b4d.bin
ad511b5b4d943a8d6d1bf8ff5f101aee7a26152dcd07aa949296807710261d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 10400 bytes
font_02_sfnt_off000142a5.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 1700 bytes
font_03_sfnt_off00014abc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABC 16792 bytes

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