Malicious PDF — malware analysis report

Static analysis result for SHA-256 159f04898940f22d…

MALICIOUS

PDF

94.6 KB Created: 2021-08-16 10:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 929f15ceb01522d3f02e312e7487e724 SHA-1: 3bf68eeebd21e359a90818e73dc14e645a4c9b1d SHA-256: 159f04898940f22d188b292348ce72dcbf70319b71a34cbd2ba431b6260eaffc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure of the PDF itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=shopping+malls+in+schaumburg+illinois PDF link annotation
    • https://xo-sound.ru/userfiles/file/63984391148.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/68677708852.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/padevozonoxaxarazev.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0074cca75---87562803936.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/93260461744.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/bugab.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15aa1ab2a---nubiletupesiridegenor.pdfPDF link annotation
    • http://baigeleather.com/userfiles/file/245565133.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/rudakupexa.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nepusimopanilo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160754642cfeaf---jexegefag.pdfIn PDF document text
    • http://cutskytools.com/d/files/zovano.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/206776ae927d71c22efc710f1c4b25d5/20398036362.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/32136788623.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1229603143610d9139bd528.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/86310116977.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9f40c648---47551425244.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/sakobusefo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/kerutivorefejudizal.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f19c7c84b14---17043792221.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/10591509018.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/damejusibod.pdfIn PDF document text
    • https://unosms.us/userfiles/file/8856827599.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0e44b729---lijivinaladexobewerufivi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da569b71094d83828a15ca1e012d141e/faxolijadopolazejuvuro.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c6ea433eab9d1276b044d375d9f926ff/55010576753.pdfIn PDF document text
    • 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_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16980 bytes
SHA-256: b7aa0cfa6aea14c6f14417782ef76b92cf0c90569379fd3021d745e3ab57ef5a
font_01_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 10904 bytes
SHA-256: 178917b794ff46225ebf985224ef569e6503fc1bdf0491d6ba4048e03c2d44cd
font_02_sfnt_off00015355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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