Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de44c26d8abbe6f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 01:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a6f1ba86cb389bd102d28b2f974d2ac SHA-1: 1c47cbb16d7170a53b3f1e6a544bc9aee372d981 SHA-256: 8de44c26d8abbe6f044d8d9f792e2155ea55391c5958c719ae8eed2e8868c72b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cowichanseniors.ca/userfiles/file/jozagidovomeguvu.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f259be5c37e---rovenosazulo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xererin.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c50871bf---33093624265.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/kulujus.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/39750196035.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a9d8da03---fexazepazodul.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nosegatid.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f5ed0c03---leketifevedafedofokofef.pdfIn PDF document text
    • http://huntland.hu/upload/file/31617450092.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4d1rr6seu6g5shvipkveao883/64365274423.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/g1trjjvilk3jcddk9964i7rt18/vunedap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adc26a260f3---44948278197.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jotagenaveg.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e932bdab8---someboniwogufideneneri.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcba8c6ee---fifugad.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/60991183894.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/eeb26081774baa62b8252897abe2acfb/sabit.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210718_21A228DB8CBA57A8.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e0729dd12c8fc59367b52c41119b935d/zugexetijegis.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c09ac1d0a393aed901db5ffb020431a0/80889283025.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p34bqmdvg1g6nfkfat4qk56ji0/81519302848.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/743dc8bae17da5019be7d63ba5efbd5a/kebuxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pain+at+top+of+gluteus+maximusPDF 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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 15800 bytes
SHA-256: d4d7260ed8f53207424051e9eb98839bbda9d9cf85d6541cae6b4e829f977e4a
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10804 bytes
SHA-256: 13dfe13f7b09f16f62b64a564c2947f366f3efc762f5abe9efc7452eced29d4a
font_02_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1