Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ccdf799700fd28…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 07:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30825612782b419678a485d4d57108c0 SHA-1: 89d93bdbff907419551e0aaa9fefed26e65462e5 SHA-256: 41ccdf799700fd28d82d60aac8664990ac07675c7636a00f1be95c391d1b711a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://geometrabottero.it/userfiles/files/tikowulalewawibeliz.pdf In PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/79509645774.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vojelanutorafufefige.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/1341177817.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/98255127683.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364222710bf---19730149081.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f088b8ae3---lewokisotidu.pdfIn PDF document text
    • http://8njl.com/userfiles/files/87325401129.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/97648514548.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/vifibetolixomakibizoligo.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/1422720556.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/feditositajidoxafo.pdfIn PDF document text
    • http://orenprom.com/img/account/file/19247019310.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/sijurenanipavuguweguxijof.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/45819331841.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/sikufus.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rerilase.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bozuzefimez.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/34482770115.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd38e0a365---5234145862.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16147546a8382b---23768599533.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/xiludipefovevi.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/8581793227.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fejabobi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161352a72229d5---94059311481.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eklkpa4sv5pi8g6cfhopcivdpu/sugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+vs+ios+number+of+usersPDF 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_off0000b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 10496 bytes
SHA-256: 240cbb157d504b21dbb6be31100410832ece0a03d0a460840443b0d803b3310f
font_01_sfnt_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 14924 bytes
SHA-256: c535c4f72f9fa4b5d43af4e46d57b473fe26d249c5dcf118816b457d004ee8e0
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1