Malicious PDF — malware analysis report

Static analysis result for SHA-256 619ee82b5875560e…

MALICIOUS

PDF

72.8 KB Created: 2021-06-07 13:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bb9868d0270f917adef8338ccfd01d6e SHA-1: 43ef28c05e49fce7228c7f7ffd7b2e66d4c35106 SHA-256: 619ee82b5875560ed76406264e246321ace1a45aa9b986dcf310e9b5ae7226c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=homemade+antenna+rotator+controller PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f8962a74---67809056788.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ef05960a02926d0212c2c82ad824d452/30537084013.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jajav.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/moparuvafowidaviku.pdfPDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6q2ih5jjkrdaqbp01shschqabk/gifibofoxoterewuguzilix.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087d555e0ed5---rerobovejo.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f6aa90a6---gesugepu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff754f712---tisunarosinojukitipizot.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/sudomotimaviluz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d24affd---getojanasasinodibej.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/21056b9f3c5d44d6d4f5ee7ece297547/73142148045.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31c636ad3---85070704421.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9c1c706a9966fd6fa7a65e8885b51d4a/bovusosusigunemubowewo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/revurogaba.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160718f3045818---71331544235.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/md0beivp8fqdd7kv48a9v1ikc8/rowomovunigoji.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9d2e4ef1---domapojisisodasetor.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d9bda34f47c647dfd636485b5a83f62b/kosexazimavuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 4868 bytes
SHA-256: b46b60f2a42f63b5a233d22c8d6eb7c8d98361cbe3dd86ce6f20eb779f805892
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10240 bytes
SHA-256: b95df7875f249a9de01a1193ebaa392ed82049e290525f56c8cf024268a96d52

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