Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37e1cbce4e25d14…

MALICIOUS

PDF

170.4 KB Created: 2021-07-07 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9dca3096bb1124024d8b9edcfcf59a5 SHA-1: ba3b391a9ab8d726acbcb946c2e7815416b37ed7 SHA-256: f37e1cbce4e25d14426bc488c53968b32ca497765c56799e550a96de9e41673f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the detection names imply an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c023hq4eiphl2t6cccfo9djj0o/16022016691.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/078a23dac02c20d8f1b9a12c32e4cbc8/32671929049.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ogattmhkjj5som224egl6sfhf7/6511410321.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160752278b2a28---37059006840.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d9d6798b0---nanagefi.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/56rshapas9sb0mkqba75dvhci7/kapufubadusetisud.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/wewezuxezuf.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/144f5cdc09b5cda808fd575fc01f6cc1/xiwowomuworegakajiwo.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073b22dbebff---68097815715.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m8fe046k3ju92m204781o0m10j/lorobegevexedaragexizigo.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39896c06d---wexujujegi.pdf
    • http://briarcliff70.com/clients/874901/File/nuwiloguse.pdf
    • http://tai-yang.tw/taiyang/upload/file/49431096380.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d81b160924990a161beebd5edd9317b/16832278995.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d5174cd9c8881a28ebf8b39ed8b30e72/sizatukadi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lo1pnl16j2b7qc6cs9hetm7n90/84014655978.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094593d5add6---waredajezumatal.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/90043816160ad1d1a2afd4.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7c03a41e---25986240459.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a177b5db445---73786335850.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/pobab.pdf
    • https://motelandratecuci.ro/userfiles/file/93790900207.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=written+by+confucius+of+china
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c92e.bin
6b92fdafbdeb93aea0147e2692ece55869d687da5814ee95dbcf5c38095689c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92E 22784 bytes
font_01_sfnt_off00020324.bin
3e7091e448001ca27a9d57446c4125eb71444d99963abcd30030b69e113607b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20324 10732 bytes
font_02_sfnt_off00021bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21BD3 16792 bytes
font_03_sfnt_off000233e1.bin
6d6e0d38ffc69277f21ca96e735c62712dfce2627b343b573df4d8dca07f2189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x233E1 37732 bytes

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