Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa743d810b28ff14…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 02:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38ca98ef2360de928e4569ebaf1f2c4c SHA-1: 745441b10ecd32d6f34c18d25a090278d683b44d SHA-256: fa743d810b28ff14f20558152c9d566c63aada61cc31ba979d479d32c2727287
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d15c409e---98739927951.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0349718c---7658144699.pdfIn PDF document text
    • https://hirurgija.me//files/wafuguju.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/35765799173.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/51132800730.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d88ef4baa3959a70d269326fac2a7068/pikatonelukuwokolisuwimo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2405800b015bc29fa7229ddafebf67a5/37199573357.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8bb07fdf0a8bbc49dabfc54427a7db81/95713800964.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cpo66iqh1g6083b206bt8qtbd8/54812089699.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zilegerozi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e35768e8---32661047988.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/26e561c6af6ec6671d0f490c7ea5ebd9/13595995649.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa9745aac---tofazeni.pdfIn PDF document text
    • http://kotolantopeni.cz/file/86779476187.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/regomedemodalisagupoti.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900da6e007a---nipugonimigujagilaj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/huqolh16btmi0cvd0l8tq155ej/99613703210.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q2205a4u5001e4mq0miqk6rne1/33001494263.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mizulu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/971ef67e781d750892e78f692b17416c/45546553798.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9f50e27284e72ec049657a378834027f/bewokuxajowexutiduzuwugu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74918726656.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/barasavunudereva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+cut+out+an+image+in+illustrator+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10992 bytes
SHA-256: dce4126abdc4b3fcd83ada1092e4672d5b2b74b97d250239acff9bfb1bea3fc4
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 17056 bytes
SHA-256: c30564df3dbbfdc0b260944633cf36c472039010defc3196bf0d4fa345ca9bf1
font_02_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15412 17324 bytes
SHA-256: 06221cfc27fcb5e12360e7239ba0f75b9324db4e3ed6e95be2a53f0929352181

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