Malicious PDF — malware analysis report

Static analysis result for SHA-256 587af155e2f62832…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 07:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a078b8501b684c3ec25cc670381cce7 SHA-1: 122751a7469c75c790209399d0b9b9e9398aac03 SHA-256: 587af155e2f62832863434c74e9775ad07931a5b2ea52a3c85f2a1e844a1a44a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. The embedded JavaScript and extensive link farm pointing to compromised CMS uploads and disposable domains suggest an attempt to redirect users to malicious content or download further stages. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=acca+f9+study+notes+pdf PDF link annotation
    • https://t2sc.me/userfiles/kuzinikijojokewojigava.pdfIn PDF document text
    • https://mmszke.hu/files/file/61735013968.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ed16a7c---liropaposadevatix.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289745ef1c---65499864464.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae9fab9b928708cc8ec1e676dc4afaff/25620116851.pdfIn PDF document text
    • http://goldmustang.ru/files/files/13527048997.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/34152694760.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/bagugijijagewesalo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c2595b9ceadf8877f900406e89f30b/61251243496.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fb7f71a---widapudunaj.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/76066553120.pdfIn PDF document text
    • http://df-foundry.net/d/files/jiwesinizudateduxabutew.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/49768023099.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/47217633775.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3a44ffa4---63157611160.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242e20e6ec---74025230777.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/o164lkm7364sb5939dlc1n76jm/52112182349.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a355837903---vitiram.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/zulekumobefarapogugenuzen.pdfIn PDF document text
    • http://beiks.info/public/file/togixorofusovinegojogon.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b681fdeea0df21cf687a6b417bf20/sadanupovude.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10740 bytes
SHA-256: ce51ca34171d6339f7c9c83b531de7889dbdbb874b7ff923798beadb3b3a8cb6
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16852 bytes
SHA-256: e198688000a54635823755804618bbe09d341d261e6f7c70d1497c907c9c8c30

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