Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1de1f418c17f29d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a9cff3ef83fc9853bf4fb79e89da83d SHA-1: 93a237693aafbdfd95ba152c890100712334374c SHA-256: d1de1f418c17f29d3d050b7c6710a59c4421fe97925a36a819d034e446ca56de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, including one using an IP address, suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly imply a phishing or malware distribution vector.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131b73c2dd63---60295979237.pdf In PDF document text
    • http://jandebruijn.com/uploadimages/files/50853831842.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/94428255811.pdfIn PDF document text
    • https://sanidom.pl/img/file/farinavusadux.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/jamewezuridikupa.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/1342103470.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/90340800362.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/kuketunejoxoxujomufepag.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144f76369c70---86794298.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42389400789.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/bijorev.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfcb3594d7---sejegiwopojagos.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vidoxisaw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cddfb1e3a---vadumufiwuporewapixe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8de8a9fed---pewitupurajipam.pdfPDF link annotation
    • http://sro52.ru/uploads/files/tefedibusananakosiwitem.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/gowod.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xigasuwikizekot.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/keforizenabewam.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/68822964758.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f624251881b810adf26d3ef3b7d0abe8/60255682023.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/53a1358fa7a2c55e0c27bd57409a7712/37738735497.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/vozirifikutefononuvugunan.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/51256586673.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gaxarixopixaronut.pdfIn PDF document text
    • http://espwireless.net/uploads/file/99219682370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+restart+my+phone+without+the+power+buttonPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 11024 bytes
SHA-256: 4b070a233d69695902f7d132b60f6bfd2004ade29f13528d10edc7b23f817130
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 18288 bytes
SHA-256: 26d56cdc44a65b616fc23df4e6da1469e269d4ad42244cb5997f47372bde6844
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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