Malicious PDF — malware analysis report

Static analysis result for SHA-256 792f1846d7b64ea2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1d24c0f97e547662f239dc71c657684 SHA-1: 65b347abf4bac044562291be63d6803ba9dbe2b4 SHA-256: 792f1846d7b64ea2562a5205337104a479c73272b4f535ce306f0d6fca931851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, content.

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 https://archism.ru/uplcv?utm_term=cpu+hp+redmi+note+9
    • http://terredellamagnagrecia.com/userfiles/files/baboseworidowazozuwax.pdf
    • http://traslochimontalto.it/userfiles/files/56463091312.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/82596853553.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/sovikagavedekozozo.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd16aa78d---34660656159.pdf
    • http://hoya889.com/upfile/files/20210904210147.pdf
    • http://volareinmongolfiera.it/userfiles/files/7035266856.pdf
    • https://masukpt1.com/contents/files/terobevanelevite.pdf
    • http://travelport.pl/userfiles/file/jatij.pdf
    • http://aibrpjoaae2.specialty-match.com/upload/files/tunojasativadimesap.pdf
    • http://open.ua/uploads/ckeditor/files/99699806618.pdf
    • http://lecostationery.com/files/file/11606102800.pdf
    • https://angelsstaff.com/uploads/file/novaw.pdf
    • http://artechq8.com/beta/uploads/files/16263454809.pdf
    • https://5ky13lu3-1251.com/contents/files/vukibokuxugaw.pdf
    • http://bookblog.kr/data/file/files/kadukadudetuju.pdf
    • http://vekosgroup.ru/userfiles/file/92162308753.pdf
    • http://gemculture.com/userfiles/file/nerixowenatofatubuviwi.pdf
    • http://www.physedu.in/newsite/userfiles/files/biwanosuxefazolofefuxuzo.pdf
    • http://fastcredit.ge/userfiles/file/76704841272.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b5df76cfc9a31fa587261731cd6672e2/99771226529.pdf
    • https://incense888.com/uploads/files/202109200351492535.pdf
    • http://mercuresamuichaweng.com/admin/file/48098681787.pdf
    • https://cauthinh.com/luutru/files/46169294863.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/53729d64c9aabbcfecb4be227ba231cc/nerojetare.pdf
    • 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_off0000dfdf.bin
fcb2e340f08b105eb2642a16795ee0b7c58497e4b263ae073f6684c2c44a21b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10580 bytes
font_01_sfnt_off0000f7d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16792 bytes
font_02_sfnt_off00010fe3.bin
553062c4a5b83e5d522912908fe90f0e4553a9ec1116a82447ab52cf5655b488
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 18648 bytes