Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d788cc09c1f7963…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 00:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f84af7af092a55eefcc5d6aa2c72ba SHA-1: 959e9bece08fdb15026f583078703d8811dec094 SHA-256: 7d788cc09c1f79638cf75e329d57f310297f1adb8fd9a56230918943a26f9489
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded links, many pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/q9h1ea30nro1v8gge4kup740n7/41014434867.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/bosogiwulefejabuj.pdf
    • http://fioredda.com/userfiles/files/15290911454.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/49181639277.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/65586375014.pdf
    • http://turar-mussin.com/userfiles/File/2916948960.pdf
    • http://tcsklife.com/filespath/files/20210912211531.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nuzatega.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/dofijazakalogilepojesuju.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d55eca93f---xaxikinavamiredi.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb833138d---23106843.pdf
    • https://aldwalia.com/userfiles/files/pegubi.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/tuxapawukawazoge.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/45335080393.pdf
    • http://www.tsahimmongol.com/uploads/images/files/pijuleme.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zugafubupukubup.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ff05159ed230c1ed6d3b707ab5372852/13082864930.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee36dc400f---foxizipawawug.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdf
    • http://wolfpackbasketballacademy.com/content_docs/32771025764.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/29cbbc0c2dd0863fe8f94f82774408a0/48578800838.pdf
    • http://zzzwchem.com/upload/files/dogevedonifebuwoze.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.pdf
    • http://m3hotels.com/userfiles/file/94966291693.pdf
    • http://angelescare.com/userfiles/file/68798502356.pdf
    • https://dampinggame.com/calisma2/files/uploads/69298336572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+delete+photos+completely+from+android
    • 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_off0000b649.bin
cf298b5716c82a1cf77f2a55e796ce5b709be8fe27f82a9389cac38afb974532
pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 15040 bytes
font_01_sfnt_off0000db34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 16792 bytes
font_02_sfnt_off0000f34b.bin
87680c5bc04552d90eb1085d6c5d98e337745b3939e0b6806e9d3bc928b98588
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 11076 bytes