Malicious PDF — malware analysis report

Static analysis result for SHA-256 1305b9f305ec91fd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 10:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b207eb6a686019d36c4e541aa21ad142 SHA-1: 2fa57cd208c62c5c5223c8dc8fe821a60894815a SHA-256: 1305b9f305ec91fdee9a24df2f9d262a87a911b5904b7cb9ad8e956900412029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=icd+10+for+adhd+combined+type PDF link annotation
    • https://gymlesgeants.com/upload/editor/file/19774284770.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/3431572344.pdfIn PDF document text
    • https://fratellifurloni.it/file/57360851156.pdfIn PDF document text
    • https://aedwea.com/upload/foto/51297366769.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0tstmogco79qu9f5dntcdn792q/62454746451.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519133717.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/juwerawukumolobonabaza.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210704054557_o1rzg5.pdfIn PDF document text
    • http://erex.hu/upload/file/153673226.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd20193f8---manaxeroxugigovugoxabula.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c217a1d5709f1e438d2d43436863dd3b/6174876738.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a424a45b6c0---bodideraxadapivomude.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160743e3e30667---72722908041.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/rawome.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/rugokogavumebo.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/kovokufuzu.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/tejuxekavatobebiveri.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5ceaa6483ef68e7e67d428b161f0f4e1/fikaguxatasagabagitu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/16889401449.pdfIn PDF document text
    • https://bliznacite.com/files/tidudiku.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wurunudamasodomedij.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/pofekolufitukuruzilofom.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 16484 bytes
SHA-256: 7a2a3cc5336892fd60c3673a64dcbcfe3a09e76f9020792d179f7b978bb3699e
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 11052 bytes
SHA-256: 05c770130a101a8ac5ad8fbb1c7aca36a33d1fb019c2b86a786eb614b693fa6f