Malicious PDF — malware analysis report

Static analysis result for SHA-256 04645e2b4f4ad4e5…

MALICIOUS

PDF

74.7 KB Created: 2021-07-08 11:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f097c9a1c9f7c217f87ec46533b2117d SHA-1: db6f71ceecc912ba26c4c9c5f4dc8aa148cf9c7c SHA-256: 04645e2b4f4ad4e5a4ae2b8d6f3d248c5ef3835bc53998999e97ce3f28d36c25
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4459caff---91424156063.pdf
    • https://zemiigori.com/uploads/file/kikefanixewev.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0e6996f35a77fd252d8b0fdbda1336f3/85775721965.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962b0b95a---17844722949.pdf
    • http://specimport.by/files/files/porebadevunizuxak.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607016d889c43---nasemino.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61f70ae21---96427412603.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/58239170467.pdf
    • https://haysalon.com/public_html/userfiles/file/kozojode.pdf
    • http://auburn-companies.com/userfiles/files/televirapapuwedob.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6c9f026f3f2bfdc1b9592a117b8c98aa/35148338069.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c19206e6c3d---busanituribajosojonoku.pdf
    • http://driver-jazda.pl/upload/file/67909719994.pdf
    • https://napraforgohotel.hu/upload/file/rurofekozo.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a0b69442f9742707d9d87619fd65cf13/27721266608.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c468450e2689d57137b36aa46652c73a/vemukedunozolisogisumi.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6fb717d7---47492256469.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4749f299---23493430388.pdf
    • http://hum-lucknow.org/test/fckeditor/file/8189429958.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ff41578a---fisujilofegoluzo.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/10538113195.pdf
    • https://bursac.net/userfiles/file/28400581649.pdf
    • http://banphimchuot.com/userfiles/file/73226350135.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/lm1080019ats2qpt4srjpslkn4/wesopanuzikajewatibexuf.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0db036f23---35272426274.pdf
    • http://phuocthuan.vn/images/pic/file/fiwananitomuta.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/tolegapemapedovok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=scp+witch+doctor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000c79e.bin
bdf5e18f0413b64b88d19a5440fd763fa9187167f6dd0175d1693b9a3207d68c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 10160 bytes
font_01_sfnt_off0000de83.bin
41cb4b57754c64e67a3123fefb8a60b305ac75077f8d080cf9e7adc45310acd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 16312 bytes
font_02_sfnt_off000108dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes