Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e99aa65e7da66…

MALICIOUS

PDF

88.9 KB Created: 2021-07-28 07:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0d49b26656ea57f6bd369e9e5445d34 SHA-1: 25157610d4a7f27bf6942cfaee34b1c9925e7e4a SHA-256: f52e99aa65e7da665f7cd7052e928ebfa8c8da19fd4a8b4d202d7a6a8258133f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a7b5eb28---13238726857.pdf
    • http://bitite.lv/media/txt/122/file/pefibi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf56b0dd2---zukufiwi.pdf
    • https://mimpishio2.net/contents//files/86579485507.pdf
    • http://muabannhagiare.net/images/uploads/files/zegik.pdf
    • http://zabradli-znerezu.cz/userfiles/file/79887626957.pdf
    • https://ckmusicdesign.nl/userfiles/file/75212836675.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/tadite.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892974b366e---lufarobajuwoxenoguxowino.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc485bdcf---51830860795.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe20c3f4ae---kifiwulitebavolimumusuti.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e546106e279---fudopijapijuxokuserusopip.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4d3854b---dofoxovikazemiruton.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd3eafab1---pipilekeva.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/61535210495.pdf
    • http://gleneaglehoa.org/images/file/xezawodefi.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1d603omealqmlcahhlcsp5ssfh/48357723925.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060500191273499.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ba869fa7---82882940665.pdf
    • http://trevorhannant.com/zedizijipatu.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f065331e60---38355636131.pdf
    • https://gastriklandsbf.se/UserFiles/files/ligebapolodikagup.pdf
    • https://austarpharma.com/upload/files/98196699393.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d2303768d53580430e6a08896d56f5db/25011939930.pdf
    • http://shophouse.info/images/files/gotomilepidetizusubez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=why+were+books+from+the+bible+removed
    • 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_off0000f645.bin
de98a0a29e837ccf708cfdbd0973dd410989cd10936900e813c03e420dcc8a88
pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17488 bytes
font_01_sfnt_off000123d3.bin
e289d67f9727387f272f20d813bc1d7b8b40a94648b50b8f631837b824be1668
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10844 bytes
font_02_sfnt_off00013cec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 16792 bytes