Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4037d93d8555070…

MALICIOUS

PDF

94.6 KB Created: 2021-07-13 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5310fae3bc68f7a37d61190bc330f3f SHA-1: ecd657cc9fe313ac47b11c815d233ef584546742 SHA-256: c4037d93d8555070e4b739f091ac691165a003db0ed1e300a7e982f0e16effa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8e308b9f2e36cfa69189bc6d6b3863d1/26811708894.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/69ekfls19td81ppaj21jkghmfv/ziruzapixekiwetofid.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bb6ab0db04868c3a0a5b8576a95b0eee/zefifojajaga.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b604c834feca324f050397cc6952faf4/noxuwapaziwi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963b3bc317d---55249440004.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3nm94en7956ln4vrnggr96ffqj/setevozivewukafu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fca378e5---kemijilawowurijib.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/22178956004.pdfIn PDF document text
    • https://tavio.ru/files/file/daguvexesadabasetum.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ab93dbdc47b807f8dc5c0a0aa6e77b93/41513991951.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/bepoduberikemaxajadodi.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/lavowibefiwatujurozez.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jm857sc0h9r4lj9qk9ccvn8hq5/kulukofosi.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/xujosefeb.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tuziroporaxovuxuwofex.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d9d61207a9b13f1d587c21337ded835d/69896711457.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc165de863a---balomopifupamefoditaxitas.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d78e9e426105a490d23a6be1a66f1498/wijoto.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/87b9993a9f4f14e3a9d0f7be7e485587/xilosal.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb07306e7f---fumitomimufukenisev.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/77095141290.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zumovakaziguza.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/daruzapuxaridometiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=star+wars+force+risingPDF 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_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 10624 bytes
SHA-256: a57c1031ac2964ca4fa583e2e55ddab04f05e2b5e8825060b82b0ae4a812f7f4
font_02_sfnt_off00013ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 17744 bytes
SHA-256: 899a360cb6cedd17625e37d17901b60b30e33b4035c9d070932551921e2c8559

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