Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca442f67767ebf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 10:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b6565f8b6f5eca40eb15cc8ac4f53e SHA-1: f67ce1815bb8dcfa33a0075e6d1203339891e0c2 SHA-256: b6ca442f67767ebf2e8b4a6b04ab902c0a8147c443181f7a009c5debc0134a7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for containing duplicate object bodies, a common obfuscation technique. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=exposure+compensation+dial+in+manual+mode PDF link annotation
    • https://ocw.tw/uploads/files/12279015617.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/topomoxokasizokefobajafat.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sumezadedigiwalogogojo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/sezed.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vmjee15okop08m375qsh3ap4n1/noviketezagiwepujug.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/24017124088.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/78170705415.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3aafa154d5531fc2cd457e76d79c5970/silemo.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nebofevofawupow.pdfIn PDF document text
    • https://silga.ca/userfiles/file/82336383357.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/robivizas.pdfIn PDF document text
    • https://razredna-nastava.net/files/tamosu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/77310654415.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160727c735018e---kupiwikinuxewura.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/83648003581.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b131e799---19206272474.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f13d5149a7fecc7312b74a1991e5d43f/89426991082.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/4931650502.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/49124307065.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/93074080992.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o1ch1o46efva7si1o3ggco51k8/86375050664.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00464c15c1---67313061065.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d758468487---niwibosufi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/55549759864.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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10860 bytes
SHA-256: 88b0f52d89a6c5dac657b2789f369887eef9b6f5c165904793974a0b3556a3dc
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 18740 bytes
SHA-256: 341df4ccef843f7d0dda17b040dc3e6760ebca29f623146723334daf51d6f587
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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