Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b1f438271a5fec…

MALICIOUS

PDF

96.1 KB Created: 2021-07-06 21:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5a229712b54a214f9f353aecf13090d SHA-1: 2fdec424623bfff2d5f29f6c01e09108a5cab7ef SHA-256: e6b1f438271a5fec5ac9eace6de8e0634c5c183fd1920a858adff26e0db96a6b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of numerous external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/buvenorivubuzilitudepere.pdf
    • http://leebyenghun.com/new/upload/board/files/94246794569.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9af0b849---tasedijizuvitisasefazon.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1c6f116daf860ea302b6d5303e21638a/difizesenunutigikenij.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/puwufedi.pdf
    • http://sklepjola.pl/userfiles/file/10524230186.pdf
    • http://paillasse.hu/userfiles/file/roveji.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k6g20rfsvn1soddp7j6pehp45f/pifodemigufutosamadexek.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gn3rnbuecoggva9cnioprfu747/vuziwawupedagare.pdf
    • http://allaboutdowney.com/userimages/pimafewenafodikinujik.pdf
    • http://mya1fc.com/files/ckuploads/files/41896722960.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9004c329f---36329493132.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84fd3195c---tawiketukiw.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/tavunagutepipanazadela.pdf
    • http://krevue.cz/UserFiles/File/43999970579.pdf
    • https://planet-for-events.de/userfiles/file/xiwewajot.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5316e4d282ccb9f89ebac41ea869a614/botixilupu.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jiwozenuzonafoxovaf.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vauobu03p23qdjrd4ubsli4urh/79558736684.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe1511b18---xaliwelaxivoxeki.pdf
    • https://jamuiboe.com/webroot/upload_media/luzirelipomadulobijobe.pdf
    • https://hanahana.vn/media/ftp/file/40246809848.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e6b0ed6c---2531842492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=price+floor+and+ceiling
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e021bae97e7ccf20f4779efeb87cacf4/vepalobuvawajafeled.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 16792 bytes
font_01_sfnt_off000117a0.bin
6083b3e6ba6b3dca2dbe1739d3752102508a436b9a5c65a6d349cab07efe590b
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 17656 bytes
font_02_sfnt_off00014634.bin
00033a194c273751c396715a2f4af0abfd3fed46455bf9ebd7c9cd5a1e28a892
pdf-font-stream PDF embedded font (sfnt) at offset 0x14634 10388 bytes
font_03_sfnt_off00015d82.bin
a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D82 16076 bytes