Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4297d9693f942b5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 00:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ae7ecb00d0bcc2c6e09519498c7a374 SHA-1: 4935f2eac251f58e0114ceaacc4bd50302350a96 SHA-256: c4297d9693f942b5abef9c073374f03c6b4881273734430877fe52cea90f6056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://laborke.ru/uplcv?utm_term=change+microphone+settings+android PDF link annotation
    • https://edubox.mn/uploads/users/0/files/63982142687.pdfIn PDF document text
    • https://scalping.ir/data/files/file/bukadoputiva.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314fbb5664e---tidovufivonokex.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/89443522013.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/emj2krt7up2aqq2l1eq7763t9e/volutefoge.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/waluxogivabexeratex.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/zazavuvan.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5b68146a2bd278aad91b857dce64b457/gabet.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/pavubimexadamekadodawuwol.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/41339845457.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/lunajiwixoxeweredubujeze.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4bfb036ef1263757c16a73acc36f02c/49308650175.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/sofuj.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/75394886117.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/fokudege.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zadukanulalol.pdfIn PDF document text
    • http://poorclarescork.ie/images/golavexulokijekib.pdfIn PDF document text
    • http://benly-carson.com/product/files/zimemujan.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/86465916316.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37707e3ea---tosorosifezegozumuwa.pdfIn PDF document text
    • https://datenglagi.com/contents/files/23103196828.pdfIn PDF document text
    • http://kechengchem.com/upload/files/xovizokum.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/58272050317.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_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 17588 bytes
SHA-256: 011a64d56ea006c1922943e4a39f2fc1f92f2db6a61c78ee6aca7ee476c1d985
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10944 bytes
SHA-256: ac32e48d3dd6e77143ef8988a5c0ab147c89ebfb754ec7d3794ce3a5a13dbd94
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1