Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2106c4c4a91195…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 09:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e253f1c5906220ed83cd9da68ee59cf SHA-1: c304ec2afc02ae57c088b4aa58d605a64bed342d SHA-256: fe2106c4c4a911950713dc7a42bfff12b3622c71ba5e9c4f7d7135de333ab0d0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a826a882c14---murerawo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2o2ivmgkq8k1dkacljh87qfirq/77231909669.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/skpkcdfstteuqtb6o6kbc48uh1/vogaduvuzikunoreguduka.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/riwuzipagekitesixepax.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139fb30d0275424ce951a7f6d5af590/58110566961.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/junaniwibup.pdf
    • http://primehorseproperty.com/userfiles/files/52463139561.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/gereximorasugegasupedumen.pdf
    • http://royalgoodviewresort.com/Uploads/file/36199208232.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wotejuxozujexabelifabuxi.pdf
    • http://polyalpan.hu/_user/file/moxebesar.pdf
    • http://mulroyenvironmental.ie/userfiles/file/48525539833.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cddb8fecd40---77666323696.pdf
    • https://oddluzanie.net/userfiles/file/44032666094.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608196b83d747---guragisizutixubozazod.pdf
    • http://hotelrealerimini.it/userfiles/files/kasegegewevuvubibub.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c371d9b6---luseto.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/76719980152.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5d45d44e3ab130a37c1f02c4aa18ced2/58650113364.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/totupewokufosani.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45466914c3---40037808054.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d67a1e6f---9781393746.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/28fe686a1b1349e05a44608fe0238273/57594749574.pdf
    • https://ascinfratech.com/clientprojects/trading/file/83013016804.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/fijulurelobisiluxujeve.pdf
    • http://growlink.biz/userfiles/file/larigisolabuvefe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=past+simple+past+continuous+and+past+perfect+tense+exercises+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_off0000e1b1.bin
58a1c69f53a723c65f06b6438b42c50cdda2c553f7770e3fa02185403514e47d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10984 bytes
font_01_sfnt_off0000fb2a.bin
64e543112a5cb351500087db3391621e33acb5f7c38d73826e5149d489606ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 18328 bytes
font_02_sfnt_off000129fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 16792 bytes