Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c3050b932ebee…

MALICIOUS

PDF

68.4 KB Created: 2021-07-03 10:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20dd662046dfb77c542e18c44c29c6d4 SHA-1: a37a1fa2996388ed4dc1ee0d04e61ace26d52215 SHA-256: 981c3050b932ebeeae9f22d54c9f4c73c347c77386b11b2dcb2c196d69d78899
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9366ae6d---28113159499.pdf
    • https://kaptenhoki.com/contents//files/totepozebage.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/61fbee2bc0fb6d8bde870f00489dc8e8/feluxaxevozumif.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/tji1gruf12boseo2b8sf87no74/firanivuxalidula.pdf
    • https://advantagelic.com/singhania/downloads/file/81245919679.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095e67e180---ropazixifib.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607953506db1a---95885871360.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bee309da4---13022075456.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dcaddb86b---74457770095.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908be26f9a5---91662364916.pdf
    • http://magooferta.pl/uploads/fck/file/ruzix.pdf
    • https://lamthong-marchph.com/piceditor/file/47726032463.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb16762e---32746202067.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d013aca92---ruzageworikewekugaxiw.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086700347fbf---lovoso.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/84055664204.pdf
    • http://tycoonmedical.com/userfiles/file/rizolonorejuruwate.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7764ea9da---22149720793.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9ac17bf48e616e7191add7c620084fb4/79696041910.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/eb95c764cb375bef19f45acb21db8bef/gawaxasi.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/22c0d292858bc26a8b7d3248b679ba5a/wipixufisavarosusewoxexil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=1+cup+to+fl+oz
    • 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_off0000b153.bin
685d4bb41ab0546a9b25cf2d26e754ade21dc8af06883002fcff72fea0f3619a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 9828 bytes
font_01_sfnt_off0000c71e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 16792 bytes
font_02_sfnt_off0000df30.bin
28536f5bf48265776d39b690373e28201515c24c1f2186dd098a331a3d0ab16b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 15132 bytes