Malicious PDF — malware analysis report

Static analysis result for SHA-256 328f3dc9964bd9d2…

MALICIOUS

PDF

72.2 KB Created: 2021-07-03 21:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287dc4b6529b9318b7c55d75896bd7a5 SHA-1: 4055e9dff003b6b1b1385abe78b7b8d31d065386 SHA-256: 328f3dc9964bd9d2b7a11d9ab854a2fb226511c51d036aa4667eb52bcae16727
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and algorithmically generated URLs, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/945b7a5cd8890ee38e134fda9147e319/13245118408.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afaea7e4445---91570019730.pdf
    • http://esoftland.com/userfiles/file/38211476608.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e7bb6bcd716f524b8f36add64f15ba/vitubisogosegil.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960e4c142fb---govotunazu.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/rixezisalozibod.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc01c442fd---borubi.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609228a81caaf---39749995986.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6cf7515e3afde1200c75992118e81e0d/96146767716.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/rofuxenexepinijapatekale.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a107c0daf5c---xisojene.pdf
    • http://consol.hu/images/uploadedimages/file/zividuzi.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3tovma4t8g3d9u3do42bkbrhjc/23009833818.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210516092418.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e6ba10c8---37068388647.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fejutoselexesorelemiro.pdf
    • http://kyanite.tv/userfiles/file/tefukutilofiso.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cd35da65---35113377659.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f6cce4dbd4912616357ff6a720f61af/70876641597.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/94821614258.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/51586398163.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f4c30f5b463f6a349e104717fd815b36/texip.pdf
    • https://avigailpekelman.com/sites/default/files/file/fonedinigufevezusovu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+be+happy+or+at+least+less+sad+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ac.bin
37a8d14d4c4b241d3ebbc3c74a5387d233aeb3e30dca8c3072aa55471ef85f60
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 10728 bytes
font_01_sfnt_off0000d04c.bin
e1410a8e58a1ae92803a21973509dd212996804b154a6948e30bc1d0d8cda684
pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 16040 bytes
font_02_sfnt_off0000f9a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16792 bytes