Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb331786547a3cb0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 15:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be166ee2e8209e8c316495fdb3137e40 SHA-1: e62aa1eddeeb4dc34ed7b9cc573191e268307246 SHA-256: fb331786547a3cb0bdee91d1e6cb0eea58b995122aa3a43514b548e355318392
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to download further malicious content from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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 http://veterinarioassociatopacinidallatorre.eu/userfiles/files/radunawagimogevova.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/vemapoberoxiwedalobalil.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709bdb65b8a---18401841287.pdf
    • https://petikdaun.com/contents//files/kireturuberelina.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f56625935---75485293291.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/4979883688.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p5flg7brqk37kpos3jcs5ue1da/291342183.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/84262626303.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2b372b4cd316449df95dc57492dea797/jatekezufarasavebu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a7dd9aa1d---sononoresuwix.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e549ea14db7---jarosobepepavafu.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/wurujikonugugulabuka.pdf
    • https://thietbixanh.net/uploads/files/34976467183.pdf
    • http://j1medical.com/uploaded/file/limoleropusavoz.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be65489784b80a1c9834aefc951e2414/21383077008.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ccdef351---mipoful.pdf
    • http://thebrownbag.vn/upload/files/39113039555.pdf
    • http://toanthinh.vn/webroot/img/files/wifitowiw.pdf
    • http://busangh.com/attfile/fckimg/file///20210809141454_1015919893.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e7234950---fikimezijasipok.pdf
    • https://musikkursus.dk/userfiles/file/37168138877.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ce5ccf2f---29181695276.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=software+pdf+editor+portable
    • 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_off0000bcae.bin
40827fdafc4c88711c53735231fa09504332e7b407163294faa4dd10177bf10f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAE 20068 bytes
font_01_sfnt_off0000efc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
font_02_sfnt_off000107da.bin
f7fb36d23b51202c6d3df1cbbc0202441004defc1686931a9f08ca1e7ae5c0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10520 bytes