Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f850c3ea13afd2…

MALICIOUS

PDF

91.7 KB Created: 2021-07-02 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cd1270a6076bee302766ccf9f34063f SHA-1: 21437e4bb1d61497c1cf948d24e540fba6b6a886 SHA-256: c8f850c3ea13afd2ed6c2fa4536dd0ba6e6dbe3735ca095e199e2d3e647733b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are likely used to lure victims into downloading further malware or divulging sensitive information. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fatamorgana.fr/uploads/assets/file/34497950453.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609834cd51258---gexezaxipijemizuwi.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02ddfccf64bff58b4c0d3dc8ee89b96a/16075304943.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c0401b7c---titirolajimasagowivuzepen.pdf
    • http://botosani.ro/img/uploads/file/50998317423.pdf
    • http://magnachip.cn/userfiles/file/20210511001644.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a05cbb05---42794986814.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc2b70e46---42326827951.pdf
    • https://folklorebridge.eu/uploads/pictures/files/debodepe.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb04376e3---noguti.pdf
    • http://taniaandjohn.com/clients/874109/File/rezamopowixuxesebemokan.pdf
    • https://kamarkosong.com/contents//files/burifurovelasuwubetugupev.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vstolteqgd1nd6rm156coj09j5/mekasowaguvuzatuxosodis.pdf
    • http://groupkaishan.com/d/files/nabunup.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3e21ff04---giladaboletunipifex.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/68360104524.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vhhdo7m70pg8mn8p90d8jkr4fi/lejedosa.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/tawaminejewipigifalizur.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1971802c6---74236832413.pdf
    • http://reicar.dk/userfiles/file/vazukidediwekowetubadipo.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ad5c7a28e0fa703f488bd439f559a48/soxugelovofizuva.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/96325ac51526abb1488c78adc31ed88c/giseradelotikuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nice+places+to+go+on+holiday
    • 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_off000101e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
font_01_sfnt_off000119f4.bin
6e234f2f27752d8c304c7e06ee32e6b44dbb0f6240ceef4e88e3b4787750092c
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 18064 bytes
font_02_sfnt_off0001492a.bin
e056a80f81d195ccb36e59d8cd112118d618b75c6652e193d870cc8409777139
pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 10784 bytes