Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e7efa6a8ea661a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 20:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501a3ff3bef145c9ac7bf7cef4fd8a30 SHA-1: 892675c3b8df889c152a25927fdef45dfbf856d9 SHA-256: 89e7efa6a8ea661a93128ed35acffe7ce0e9c76f0cfa84fdb745bc7c0970eee6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the sample being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/c9t65ucgo7uo2vptmuhjc16epi/todukametadomumoru.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qpfj56ipj6j3rns8qcf1ie6jno/60387179211.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e5ovuesiu8nh0gpv2lm20tvhnv/sopitaf.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643c7ccfa0---felexujegosaw.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4393ccfc6---wuridotusejunorug.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683b18da74---lisemebi.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/37dad2ae50669ba6f126f3af99f28601/forasejogafitufawaxupu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/50ce65631fe3d49d37d1219af00b06b5/8100618956.pdf
    • http://portalcom-b2b.es/img/user///file/_0738680001620122649.pdf
    • https://tortugafilms.ca/adminfiles/file/90436036345.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/te9o6hqs41knicaq869fpheo5u/35102723531.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af9aeb4b5---vuporurumedeluxa.pdf
    • https://apsco.ly/userfiles/files/56323071328.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vcq1ato3gso4sbr04t34sl01ks/kopaxubemoxizutaw.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d66ef6e3---vomuvugofatefonodeb.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/07fbaa327a8c3f7ddd961f8e39a68a46/kazilofojomalodur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4450cdd5a---zugivixafamu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/642d4780dbf538404b6361843fc27ba7/11568450206.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160883497ba41b---kijopidavel.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/44525801863.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ppnkrh4kucmuso08029n70e1o1/23210867472.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0ec71aa7a8be2dff17b8b2c2806f6a69/35854167260.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/h58asevq137du9uj4mjjr14o7i/47934695906.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=to+be+bummed
    • 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_off0000ec5c.bin
d5560f3f3969bbf3f0a7f5f3c6eaea9be25539f25adf0603f979ee3ef60867b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 22132 bytes
font_01_sfnt_off0001225c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
font_02_sfnt_off00013a72.bin
ea7df2d743123f5eba06c146eb6f8b0487d071a40d5b55dd0f6c305b34b27cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 9840 bytes