Malicious PDF — malware analysis report

Static analysis result for SHA-256 40685451a65a8b3c…

MALICIOUS

PDF

104.3 KB Created: 2021-06-28 16:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a03d83678afdb6248b19d1623f00e11b SHA-1: 4793e6330492e67ea632137216c364394673e1c3 SHA-256: 40685451a65a8b3c88c014eec93faf7ddf4d0dafa416c5d797e850c2655b9958
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a significant number pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The primary attack pattern involves directing users to these compromised sites, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 5

  • 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.
  • 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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d2bd82ea99c1882fac667cc0f02d7bcb/53503435440.pdf
    • http://mientaytourist.com/uploads/files/gariwukuzubodafo.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/65bc82ce8f01cbb8cc51490bf34e5558/80982626820.pdf
    • https://beautyyaurient.com/editor_upload/file/zulizuzinoxikekif.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqeraarpkrl5ols2fqrajuv0n1/jowuv.pdf
    • https://canevastoilestjean.com/upload/editor/file/44447568661.pdf
    • http://lyzebrno.cz/userfiles/file/defif.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b1952c851---miwisufefobosozuworobitu.pdf
    • http://mawaevents.com/uploads/file/15796201179.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce90683954---kazafutazep.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16087c642bb5bb---dinaxozozupilomorimakonid.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/22016b518e1bf34bc0712981784cee49/mumuletawuval.pdf
    • http://aire-limpio.com/img/editor/file/wozitevu.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26ee373f---37790166438.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a1c047dcd981df597ae0db57dae13a20/19988372681.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaca23ea7---85252628582.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b7b6b451---sodesonipelekipafu.pdf
    • https://ratsimae.eemedia/contents/file/80913288559.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9cc2a52a---48099890329.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/103marnef477m1vp6c5s5uctkl/78794015778.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/domuxasosiro.pdf
    • http://gernano.eu/gfx/userfiles/files/kanewesopu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afc193509---bifogimodoruvegoninijo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meatball+rolled+off+the+table+lyrics
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd24.bin
913c9ce91f63aa9811ec013d01449fcf552681ac2cf545d05421fe0eb59abe7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16264 bytes
font_01_sfnt_off00011318.bin
fb8cd327e738d94a0022e76a2d4752a5415c0fee350d03e423c927bc61e34444
pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 9348 bytes
font_02_sfnt_off000131bd.bin
533e6d08f95b577ff914d025c721ee7a49b901208ad57ed9f3dd3063bf532590
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 10716 bytes
font_03_sfnt_off00014a81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A81 16792 bytes
font_04_sfnt_off00016293.bin
2c7f8bcfed5802ecd3c978dde405e83402e204d8aa03bb4a2da656016930a75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 18936 bytes