Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b8f231b08bd81d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 01:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb71a4c605d98d4652617bccad544421 SHA-1: e7e3f2857af9853449a955a0db58b6dff610ab2b SHA-256: 82b8f231b08bd81df9f34811c754d56ed5019573c114d5d1b6745165aeeeb808
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://105chers.netsociality.com/upload/files/67181969651.pdf In PDF document text
    • http://iccarrentals.com/files/file/ligofomiteleva.pdfIn PDF document text
    • https://hobbypet.cz/files/file/megulusaduwinexakopufudes.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/tewawilatunu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/lofosutati.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/11757535033.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55874592162.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/xenisobikube.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/39571237251.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/42776070927.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/lupunuvuluwevesivilezomoj.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/ramitugifedolu.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84855861260.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613908de6b2e8---40699701451.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/serukupanibazo.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/95625162408.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210909051042.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/porubirejezuvogorowinov.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c022e6e53d9df10e661e0d0aa6604c3/31025520086.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/3745487651.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210909061030.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/97190601082.pdfIn PDF document text
    • https://themalc.org/files/file/20184211665.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wogojisogitelepebapadaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nerve+pain+down+arm+into+handPDF link annotation
    • 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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10572 bytes
SHA-256: cc1d7c36eb6427bd7fa3273204d1342207f7fca4c2391ebcbaae8f4c62404311
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 17752 bytes
SHA-256: 9041c9c886ece4db1f2d84e3cce710100849bc507adb59269c0339b6ff8ca156
font_02_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1