Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d11d6ecccc39d18…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 13:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19a6bcaa8a83fe8489657ed73b790628 SHA-1: 98e1b02138b9e6119cf19655f11f4880787003af SHA-256: 9d11d6ecccc39d18dd00f1b6e120be81595e48c59c315e876d209ae6c3d83b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://willbramephotography.com/57792790845.pdf
    • https://peintures-descours.fr/fichier/files/kakipuvarezisilado.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i88m3s9duripe2351m66ghphjk/sujipazenifilejiziketuwox.pdf
    • https://academiapreprod.riportico.com/userfiles/files/tomatolexamuxusixelewo.pdf
    • https://torgradio.ru/new/files/file/varenuromegifalenasoruvog.pdf
    • https://dotcomtravelegypt.com/userfiles/files/92222168920.pdf
    • http://bifruit.mk/ckfinder/userfiles/files/wabolazovudaf.pdf
    • https://hotararicedo.ro/files/files/bamusivanavinotox.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/65233289189.pdf
    • http://traiteur-ribot.fr/userfiles/file/27983000944.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d63192af7---62184082860.pdf
    • http://auburn-properties.com/userfiles/files/83355621801.pdf
    • http://professional-tuner.at/uploaded/file/gulakitubukibo.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f420e9a7d7dab657beb0b60968c73890/86938012582.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/juzefovekox.pdf
    • https://muacash.com/webroot/img/files/dabadodejetal.pdf
    • https://torgradio.ru/new/files/file/45984709959.pdf
    • http://venusland.vn/app/webroot/img/files/javepebufisumemubulazupem.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/q6bc7t9eb1ou7caos3oc3vovl9/61365906447.pdf
    • http://www.bongbansaigon.com/uploads/files/84652064081.pdf
    • http://emirates-offshore.com/uploads/image/file/72063239369.pdf
    • https://bliznacite.com/files/gexepugavofegexiwute.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=characteristics+of+different+types+of+soil+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
font_01_sfnt_off0000ee4c.bin
f67eb4f2c59668e18aea1ec21b51986351f15de86b6704d9f9301839542aadf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10864 bytes
font_02_sfnt_off0001075f.bin
b4519f1fa0e24ae222aab544b5aa552e48e6dce0a6b5ba55084460fbec6d80b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 17136 bytes