Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c3401eb287b49…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 08:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76a5449a42759fc4e84feaae1a4e16d2 SHA-1: 66edbc4234b3ac809c289de3aab6a20795de986b SHA-256: 100c3401eb287b491451d27d1ad40d1f6dda79195f3fbeff8d3a5b8d4bacdda5
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links, likely for SEO manipulation or to distribute malicious content. The presence of multiple unknown and potentially compromised URLs suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mauspro.net/upload/files/belopedanutimoniboj.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/41704983573.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/xumif.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xiben.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f314668c3d05775496ce90ec6d14deea/detubobunurajezazuxigadu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca85797b8---nenesegedaza.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/41988904168.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/93154656378.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/mesulode.pdfIn PDF document text
    • https://isleo.com/i_photos/file/11330609292.pdfIn PDF document text
    • http://donghotam.com/luutru/files/memowos.pdfIn PDF document text
    • https://dcimx.com/files/7486503457.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/wiviruxabamerigoragotazav.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1bfc15cd26ec2a4155e06cd34b630ce4/50455548833.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/miwobemuri.pdfIn PDF document text
    • http://fedime.org/imagenes/67898517061.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57823045520.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/pimaminojotumejoba.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_040822.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/edeac9dc75047f04d0290bba56b1d98d/78976298798.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/lutotaziginan.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161300e29cc557---nudosodixokiduvewedenifo.pdfIn PDF document text
    • http://greenld.com/userfiles/mesaxukevixufa.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/ferolasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+watch+scoob+for+freePDF 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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 18396 bytes
SHA-256: af492ae6b21c6b3a8f0a4318ae38aab88b95e2d0146ec2d18663289e345b8362
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 10408 bytes
SHA-256: 23e69c7ddebba1e2df0d188361d1c2559c6d062425ec69ddec24434c54331134

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