Malicious PDF — malware analysis report

Static analysis result for SHA-256 64af3c23a870a30d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 11:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc9630f6c6fce013c4ccf266c85745c SHA-1: 27efa388b6a80c3d92d270024825d5e4318a4746 SHA-256: 64af3c23a870a30d69013a32d28f70416375aed4eda27030731af40f3758f407
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted hosting suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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 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://lighthouse-connection.at/myPix/file/nivatudanomij.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/84044485777.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8630c41e8d25b34a41b59a9878cb26c2/fetuxowidux.pdf
    • http://espacioschillout.es/images/admin/file/30968422933.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d777d8fe---dajogakukujowedivoxovis.pdf
    • https://amatnieks.lv/pictures/image/42324577347.pdf
    • http://tarnava.eu/user_images/file/rewewi.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7977272c4f058723753d69ade90ec73c/simegosunizamemige.pdf
    • https://mpksieradz.pl/upload/file/zakabaju.pdf
    • http://caopump.com/admin/userfiles/file/30258303440.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/dde7894ddf24f505eac01d23617faa33/61250868032.pdf
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/nabiputoz.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e4ttf51tfaogivr8ei7udio8co/55510024648.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/xevibesaxopatowuxanumino.pdf
    • https://sharenkon.com/files/vatisofadaketinezupuxawu.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083337a3e39f---xapabadazulifenisozapajor.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c34f0c42---56529520572.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/10c2dd8667a0cc7b9eda7061eacf93f5/rorususodelopefunujeneb.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/vinodosi.pdf
    • http://joy05.com/_UploadFile/Images/file/23144211248.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c47adb1f7fc---faborofinimikebowipuvip.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2bf5ace9e9e8d4212625d55f5ba8fd7c/7008130492.pdf
    • http://ty-universe.com/image/files/20210720_163048.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210628_5C601D2B6BBBFDB3.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/11105602334.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=projectile+motion+summary+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_off0000cb9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 16792 bytes
font_01_sfnt_off0000e3b1.bin
cabfcb148ce9a1985ce7e3a436545cc2846b53212a2c66941cc5d8db08a7b9b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 11128 bytes
font_02_sfnt_off0000fda1.bin
b9981881a0783fd523bedb433e450c8d6cfd71d13430b3e3d5b0d525b254f382
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 21172 bytes