Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f980e2cb11aa156…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 22:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1ea72ff9579141cb5b8b81dfa9a7b2c SHA-1: 9f8f47d1ebe3bd19c85bf13796c3581caa4da470 SHA-256: 3f980e2cb11aa1566cfe668885c348f10277b5069cbb759db1ce65bcadd06dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9f059176---rebewewigoganixofilolop.pdf In PDF document text
    • http://euredit-editions.com/userfiles/file/fizifoxikidixelotiroget.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xufudipawotes.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddf23c703---modamoririwimojada.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/goparisegimiko.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/pifovewewatejap.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/40901399522.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9bb8a2113ad44f37ffee88928b4d16d/saxoxasovaxevik.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607923e621d3f---lusimugam.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/jevokulodejonetataxotiw.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugobojiguvezigizijogo.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/vulapifapisakoxawurunob.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/85527453766.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/10699713186.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2c540f5b63a3ae8b7b5e3955133477b7/nawad.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/55608315020.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f27d3a0cf58---93008642140.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/remimog.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128f829c2d19---8713958971.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/kinimedo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b93b3696---75731615262.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2d8625f9---jinizezes.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/popujebadaludelodinigikux.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/5baa5c49aa07b77cbc720ae325d8c8ab/1193894971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=urolithiasis+review+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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16644 bytes
SHA-256: 37a8ef04ab0213ebb1974b693a1aa42914eb25ce89020dfdfeeeaee181577554
font_01_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10648 bytes
SHA-256: 387db23e8beaa9e0b332151b1c2d71b581485666daf8af581b3c307f45999a03

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