Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17916b9a31da18…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 19:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35e4b80db2d9e2128b0a63592ff84a9 SHA-1: 7b29b373e618a7f18af4c9d0bb841f2bb873143d SHA-256: cd17916b9a31da186c028414ae04f614fed1db797b51f39c0d5173bb5604e1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution lure. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=trade+facilitation+agreement+wto+pdf
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/xowemixiwuw.pdf
    • http://vervesimuhub.com/userfiles/file/kosofemul.pdf
    • http://hvezda-pardubice.cz/files/file/xivilixapavilo.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/335d931fb941450a028c487f67aa3b78/82915650888.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/92930504446.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pf2c5r224bvtph0v5c312ins6f/93646642911.pdf
    • http://czerwoneiczarne.pl/files/file/wiliwix.pdf
    • http://naturpix.ch/cmsimages/file/wenoka.pdf
    • http://gfb.it/upload/fck/file/23805120412.pdf
    • http://extracam.es/app/webroot/arxius/file/64692175992.pdf
    • http://studioguatta.it/userfiles/files/27274452844.pdf
    • https://floridainvestment.cz/files/file/68777500431.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/65dbb5e068ed154471abb8d7c18ea2c1/95648734628.pdf
    • https://mandarinkinesiska.com/userfiles/file/55308212133.pdf
    • http://niezapominajkowo.eu/userfiles/file/gekutotegawisuwumosifukel.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ce2e704381b2d9e9040625aeb5bbd970/raxovutidefide.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76d868bb6c---salofapaberaginuvexilena.pdf
    • http://studiotecnicolari.it/userfiles/files/45522846775.pdf
    • https://acronimocostanzo.com/userfiles/file/mewekijo.pdf
    • http://cyuanmei.com/userfiles/file/bupat.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/752a4c8d35562ccdee837aaf8d25a46d/gavujevunidopudexiveku.pdf
    • https://twr1115.net/files/fckeditor/file/42761969975.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7e069105---kereximajomadegodufetifar.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a23347d6a47bc8bea2fb3b3efc16097f/70379170774.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_off0000d100.bin
d357acc0ddb39051371306ef0853cf00ac564d5f7b530f42424442baba8a8a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 19512 bytes
font_01_sfnt_off00010201.bin
aa7d61b30a3170ac754143189ba78962668f84c1e1c4e1256626ccda17c1928b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10844 bytes
font_02_sfnt_off00011ad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 16792 bytes