Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12c8b0ad5464a94…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 04:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68c18b393f8e4a5afb74d82e802478ae SHA-1: 3f7939e1a0d763b3a62e0e14c9291b8b0e84dda3 SHA-256: c12c8b0ad5464a94b94498513a7a566e039d6dc55d1c176d805c2bb8874e130e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress upload directories. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or phish for information through these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://businessservicesuk.com/userfiles/file/jikowexamorafubo.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb083b8dd11---85189258631.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/70408704927.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210621/file/55609461836.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/fupetas.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/61049683081.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/19729944287.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/sajuzifedivigev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898de05b63b---87411697237.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/p1uorhbu4cdihifc329vvidj01/31392549656.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/xinogirepukevijakalutotim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0939186e8c---54397002978.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782532bbccd---xubajisol.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/xekapekisimekovutelaze.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/69302692820.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/xarizukadipumoririt.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/59674300462.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/pujopuzesesepepatulofobat.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tafn55bje7tuhjfcip6a5nrt5e/bagixowexegizajof.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb7519d97---bexikigimitefofarere.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e88757a3---xolaxadatokeregigovemuj.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/63564355846.pdfIn PDF document text
    • http://cloverdiamond.com/file/lapuferotixowigalapos.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/rodizetigajavuxinobaxi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/bolesewodadopuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=design+thinking+stanford+pdfPDF link annotation
    • 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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 17120 bytes
SHA-256: a4185be14d52ad47c0a89109eddf438633e71b411589a2766750c759b1ed2693
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10824 bytes
SHA-256: 2b402c140c9c52fbdb8776207728c526a945fc1f8c008e645bb038fcfaea1477
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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