Malicious PDF — malware analysis report

Static analysis result for SHA-256 870341646b87b5d0…

MALICIOUS

PDF

79.4 KB Created: 2021-08-29 04:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bce1f79380d52203821d97291d1c7341 SHA-1: 98679455e8d68c6506344457fe5257acbda31bd6 SHA-256: 870341646b87b5d0b0bae69a539ca2f5d4a4cb90b6051f7e80de0765bdb6560c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to obscure the ultimate destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://consjurist.ru/uploads/files/78752266955.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0bc1919b6eccac007520dc36f88ea1cb/jimuze.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozag.pdf
    • http://wf515345.tw/CKEdit/upload/files/47785789972.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/plkm5tc45dseuh5ms9f5f0l7t4/xojopopelilomur.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/9oh04kagosns6cd55v8lqd4k90/dunugezinolumamona.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c202f3b9dd5---56419071692.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2021ef226e---59004910493.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f52cf1b706b---87411959577.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/eotc5pn0l773jvmk46k263jecg/88340650900.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/90252723459.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/memudiran.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/84160545488.pdf
    • https://westhygiene.hu/editor_up/gerekuzomu.pdf
    • http://arredamentoambienti.it/img/file/gemuzosuxumitawazodabiz.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/48985736482.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e885da1d---9294754024.pdf
    • https://ytdrive.com/CKEdit/upload/files/58949275244.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u10a3qvvdr9vpod4me2b43ogh5/4950018198.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b351ac37c50---tesoluvixezetusolax.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d4a758f249e5676d59f401451fac2ea7/3989847821.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20dc2f1e14e493663b6f78cb3976e18f/totow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jessie+ware+say+you+love+me+meaning
    • 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_off0000ca74.bin
410bfc87ece3aba3651ed5fad3c1634e2d9fe6890932b57883f854d5756c5046
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 10708 bytes
font_01_sfnt_off0000e31e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
font_02_sfnt_off0000fb30.bin
67ba87132bbcaabdfa7828abf1dbc5ce5f909cbfb0b97dc9b6c8ea2480113527
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 20008 bytes