Malicious PDF — malware analysis report

Static analysis result for SHA-256 4970cf2a9577725d…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb9f471382eb20b40f0a8cdaed32869d SHA-1: 8b5ac1d818a2804ef6a26552485a345715cb886e SHA-256: 4970cf2a9577725dc0368143280e398752a260446c22923f06b12fd999d9e947
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=jurnal+flavonoid+adalah+pdf PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1u01sdk9sbinvgtbnnsbjqu1f2/vagedorobigedenowove.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c69e548f37bb8d5400c2a75d6c3b7fc6/63466553095.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/fuburumimofuroleporulum.pdfIn PDF document text
    • http://salkim.com/userfiles/file/99772846441.pdfIn PDF document text
    • http://schokozentrale.de/idata/rokugazifofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608848d0d6e4d---91014430218.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wutulolepojasevuko.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zegijo.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/99115600979.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/pobikajukelojot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fea072dc---tozixisegivixegor.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efce25587.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210629035815_ODM4ODkwMTQ0MDY=.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabb5d41b7---72359956781.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/vosamewuvadatovisaxobugat.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/38060977094.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/rufokeb.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/gezuzuzuwutifowax.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g9tlshl7bpb4d3slbaueafmv1a/34316757570.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/5262267327.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kf9pk5snfcuqju4ecgpef4dvm7/61686338010.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nowonurizimimitinubafiwe.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be48038ed90---84588786352.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_off0000b8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 10352 bytes
SHA-256: 223213ca578774fd7770d9420816874e05272bbd255192d842031ad746d8a063
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 15948 bytes
SHA-256: ab3487039bdfb3cf69bc44bebddd47ddb59c6c4ec58fbc181d17a2c627c20c13
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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