Malicious PDF — malware analysis report

Static analysis result for SHA-256 468cdee16a98dff3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4312e0eb44d9afe5e72425731085a30 SHA-1: ae30657255db0c4a0d319949528d9304970a240d SHA-256: 468cdee16a98dff3803213f84dcb251b4a75e7a29e7495361fa355f8c26ec55e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xigmatek.com/upload/files/13996265672.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5cfca7b819ea5df0074caa5d5d491537/69407518810.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/66e6ae8d084bca71d1e392e84cb88008/sumimemojodaporiputejagep.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1243eeb39cb1323f40fa7f9fbc44fdd8/xirebifaburibafaxetefebim.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/63978959561.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/65381739809.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/91054690504.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/nadixagiworuwamivokikena.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121970ad9eea---78054528244.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/46762251136.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e976c06bf---38890334355.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/rukugexaxibedokowufoza.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/970c43f1107a6994e31a8ff71e2a846b/walusanimesapa.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/91616250039.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076573f836b4---pivefososonaxi.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/18685545273.pdfIn PDF document text
    • https://mmszke.hu/files/file/fivevirudamosirebaf.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b5056fd5862fe8d41c7886e582767b04/30308377459.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e78bc274131---90887561460.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de0eab2b065---gozepuv.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/23074938846.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16070273955214---wuzoge.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/wiwiz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3498ba---77146538091.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2cbb12826271efb6a4e676dabf4cf3dc/konozixezotanodovifodejol.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39854337253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+mathematics+form+3+questions+and+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 11320 bytes
SHA-256: ad1a7199922fe708da5d0f649abe129fa43e458dbfb5a8fcba5b9008a013d055
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 17484 bytes
SHA-256: 5a515fe51f533e1671989f2337a647e45941b58476191de07f3511f54d64e625

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