Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dcdabf78b3b16c…

MALICIOUS

PDF

149.9 KB Created: 2021-07-12 23:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e03c9f0f374e7f37bd2c94801b58a78 SHA-1: dc0f4510cdccf9cc4d46abc5e938c3ce35b14dee SHA-256: b8dcdabf78b3b16ca15e46ac889e0cd72c092b221e6eb02adeef7a157192ce47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=ivent+201+service+manual
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec37c6a54---48220450917.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc9fb0facd4d4002e597c6c79e8953db/zulunutabepadanafe.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7up872n5lsurgdbifo9arp9063/mafukatevevedaba.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a565a6c33---36913890458.pdf
    • http://richmediahouse.com/admin/uploads/file/35119836304.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e78e8b77---fabimufu.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/429416c6078c192699c87540ed5d52a5/65842133557.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789a9b9b69c---46107076972.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0391e53b93---56354053104.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d942a79b16c---12222989990.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/o4j4a7l5du2d1sm6qkokrh1gj5/fidexikebote.pdf
    • https://windsbs.biz/files/file/panudobe.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefeeab261---xuparekisavasoru.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lidizufepin.pdf
    • http://aldara-latinoamerica.com/userfiles/file/21352331824.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/peligavoseboloko.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7njnk4hchaqbgpb35op6isbp3s/dujopugujuxowitebizusux.pdf
    • http://abogarestudio.com/userfiles/file/3947061310.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879895de73---terav.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/82214227572.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/ginovubij.pdf
    • http://rajskiewakacje.pl/userfiles/file/91225936683.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/pebenov.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b90b06a7a7d3c9428f87b14d55393e9/73000937187.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_off0001e330.bin
9b60e07e76f9add3628322532173e6520984e88577102b6041d7427ebb33148b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E330 10684 bytes
font_01_sfnt_off0001fbd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBD9 16792 bytes
font_02_sfnt_off000213eb.bin
9d255e3a1440c917ddd700565d7e0ecdfdcb077583ac071ac871aedc649ae491
pdf-font-stream PDF embedded font (sfnt) at offset 0x213EB 20968 bytes