Malicious PDF — malware analysis report

Static analysis result for SHA-256 646301ef25c59646…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 500b5858010cc23e64b36600c0a888f3 SHA-1: de23e4312cc76bfab4fdeb3eec4eae03cd60b520 SHA-256: 646301ef25c596465eb5c50ba796141ec087b7018f5dc49c7331eef13fc109ab
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9997fd46---wafarefijojezebozam.pdf
    • https://p99.tw/pro_pic/files/66500709751.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/b05bc59b6749f54850ce738569130f5b/71919531181.pdf
    • http://jorkurojus.com/userfiles/file/remogesi.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6bb2cf65e1eacba7bdde26ab45215f00/punaxovalijusudufuv.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/mepujumibesazevajiken.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a7974abb776b6af35c08d1891b3c0f00/xixasunevavawupi.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p7ona4eklg6r7qbsbretrceojb/lidewaxetazoxe.pdf
    • http://englandmatchshirts.com/assets/file/95880278833.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1f614eee6aae254d1a39d34640fb72c7/zipabofubonobenujig.pdf
    • http://ladyqueen.it/userfiles/files/mofefiwe.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8dae2ab1---27132447171.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075741a318ea---jukatitododiza.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8768266242---kifafedafesenegijegitar.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/judanetunuvijit.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mazeguruzomo.pdf
    • https://betenenergy.com/sites/default/files/file/62055215137.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33211761804.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35774d7c0---vewubuwujavurij.pdf
    • https://alatheir.com/atheirwsfiles/file/gezid.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tqi73q196c6m7oo5spihj60ui5/sebarevavodeladanutaxez.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c213121f5cc657151546de996588cd6c/73643148190.pdf
    • https://kudamatsu.org/userfiles/file/5566813346.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/21b4fdf1436e7b51c9587c7b412986da/lajotibanawufivov.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/59729694381.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=consecutive+integers+examples
    • 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_off0000e4ab.bin
10d7a00e344b990b8575a2bc72065d3966e4e29c4bd8a9ee76f800bb1745a511
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 17228 bytes
font_01_sfnt_off0001115c.bin
cd21dc6f4fd92e252848e93585531679d7e770735d91ff1101fccaaaea2c582f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 11016 bytes
font_02_sfnt_off00012b10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes