Malicious PDF — malware analysis report

Static analysis result for SHA-256 a595fb9c4566a1ce…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 21:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c9126117504f629390f13342a34304b SHA-1: 2efe0cc7fb74bf0638ebd81fb1216218d13d339f SHA-256: a595fb9c4566a1ce31dcc1186fa5ff3c77bdcad464b05ed0f2ccec2f91dcbc6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution campaign, indicated by numerous heuristic firings related to external URL links, including those hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document serving as a lure to download malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=vidmate+old+downloading PDF link annotation
    • http://tokyo-sanritsu.com/userfiles/file/pawukipotasogutopusurusur.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/misidekidubezedesirixil.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/fidiv.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090905364873499.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mexipe.pdfIn PDF document text
    • http://didopack.com/files/51781356021.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/nokizusuxukubikuduz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52fb47ed7f2a8d2f46fab4975040edd4/66758120756.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/bivobogi.pdfIn PDF document text
    • http://furniture83.com/upload/files/80192268652.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/55925343654.pdfIn PDF document text
    • http://altus.pl/userfiles/file/semevagimube.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/lifani.pdfIn PDF document text
    • http://fkhd.cz/data/img/rakabuse.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/gukopave.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161471f00061ed---titad.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/42093181824.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/33d87f7e5a3edbc740eebf8230783486/fuwaramabagixerofav.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gejuponubipafiroxo.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/28293027683.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/xokodolejaxasimogipazi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/3811566935.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161345ea7cd303---23491577261.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/33713399967.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/bisevug.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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 17032 bytes
SHA-256: 1b28f6ce8abb4ba1ec7f2855a6805f88f2b5be6d6a17f80d534f1a9cb75f01e5
font_01_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 10380 bytes
SHA-256: 5cfb5c9577eafb9f74094de13d090a00cc1463c1527dde698a5c3daac897813c
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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