Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1a57efc7b252e4…

MALICIOUS

PDF

83.4 KB Created: 2021-07-27 05:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87b3ceee3a2df5114bc82af94e7aa017 SHA-1: 927957cfd2f474925fafe1877f36bafbf861215c SHA-256: 5d1a57efc7b252e4b7df46692c40a34c82f3d8de24c2c49998f98eb33bea35ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves embedding numerous links within the PDF, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a390f313c79---metogizakan.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///25759263948.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/xanuxabip.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nulejutavagoxavebolivep.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accb6eb3ff---16090667144.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/97329263853.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee17b64c3c0---nakonixukuwojonedikepizad.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/46660239040.pdfIn PDF document text
    • http://soles2walk.cz/data/file/26862169113.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795e4d03e3c---gezusavasa.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/mafuwufar.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/debagoduzum.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/wumilebaxomolunifevubop.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/41675721286.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/tonunafoz.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sogunosap.pdfIn PDF document text
    • http://kbchina.de/upload/61136860509.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/2261960374.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0acda39ab---bubanopawoneripa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45309626200.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5949712d---95688250600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=algebra+y+trigonometria+con+geometria+analitica+13PDF 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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 10864 bytes
SHA-256: 30f8fc0ad5a06b123a1e5121d787639c876adff99fefe4b305660ee9db3a8ec6
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 17044 bytes
SHA-256: 0eb275ceb23c92b750997dbeb0e4aacbc48d8b3d808f12cecfb07af080e2926f

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