Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd1cd32eb52305d…

MALICIOUS

PDF

79.9 KB Created: 2021-08-29 03:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 298a6a9cf30150abea470ad0a08a42cc SHA-1: 69c5c557709bfd252feffeb06f78742864ce3496 SHA-256: dfd1cd32eb52305d4aca0ae94ae5fce942f3f807ed04a22a7ac60557f462894d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://erdbau-rauch.at/98610261810.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bpnocus0c3j4114n9eo0oohfdk/83568329613.pdf
    • https://weborder.cloud/userfiles/file///zezefavud.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b3261462---tutadabefevab.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e2bb3648---29526243604.pdf
    • http://planetamama.ru/files/file/wenikasuzuwezala.pdf
    • http://kayapaliinsaat.net/file/mizuro.pdf
    • http://studiocariola.com/userfiles/files/guxevorivumefojeboxi.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210521193352.pdf
    • http://adance0112.com/upfile/editor/file/xelowabisodunoxi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4c12208c---82718091977.pdf
    • https://cli-kh.com/uploads//files/202108082058465020.pdf
    • https://humicdp.com/uploads/2021-06-30/images/files/kosiladilowekesarunaxef.pdf
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdf
    • http://nuestratierrapremios.com/campannas/file/sazimagu.pdf
    • http://roocenter.ru/upload/file/levenilodetib.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/684di6pqmq7gge66mhl1dhgdrj/98412900322.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0gjr2d170fvksb8mgst6a7r2s2/57933352238.pdf
    • http://pdww.ru/ckfinder/userfiles/files/muxozavaj.pdf
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/xunodonubekiseximuf.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c75d12183---3577165975.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04121f6ee---25165938947.pdf
    • http://emannsltd.com/userfiles/jadituka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fox+red+lab+puppies+for+sale+in+nj
    • 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_off0000d14e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 16792 bytes
font_01_sfnt_off0000e960.bin
8238edd319751d4b2b461516e04e36391c52fbcd5ab307b43cb04fbd7bd9d0be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 17832 bytes
font_02_sfnt_off0001178b.bin
a75b23c1a8b928a20ab75026a9ad3186bef9c3f363555735b0c926aaf061e34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 10844 bytes