Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d4b2621d0b220…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 19:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 95a6ca5f19a10df84df04cc0fc5666e5 SHA-1: 1541470c2fa7f1bfca1aca67977eba841653fe60 SHA-256: 895d4b2621d0b220d17c308613b14af19bb8f9d959d659a6b2847da405dd1efd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, some pointing to IP addresses and compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cmuniontravel.com/userfiles/file/31099606481.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143d14c6b763---80582878275.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/setekupomexemedoleke.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jupinikepabufewapak.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/17516093809.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/musawojonipuwimif.pdfIn PDF document text
    • https://kapefashion.com/files/files/xoboxuditagarusovijawepa.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/tesureguvarux.pdfIn PDF document text
    • https://flomogroup.com/upload/files/20905201089.pdfIn PDF document text
    • http://teresachild.com/upload/files/78807648393.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb9a27fa5---39783905369.pdfPDF link annotation
    • https://agriplan-rs.com/dados/ckfinder/files/ziwuxejetin.pdfIn PDF document text
    • http://infracsap.hu/files/file/dutuwafomasawema.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/zagabifatoputenixibi.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/jolaboxijozinoban.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e3b3e66c3---fipojatapasagi.pdfIn PDF document text
    • https://bloomeng.com/uploads/wuxaferetasusazisotivam.pdfIn PDF document text
    • http://dsagco.com/Upload/file/60168632805.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/kituze.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zedixelomizejaxowij.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/22527119052.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/misebe.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/14155156531.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145889a2ac10---lopuxozulefozeniwag.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/50032112036.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/nibazonunusovekunezetani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=light+orbs+in+picturesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 2192 bytes
SHA-256: cfb1580163e84f4efb6b278a67b6d9731dd035c0dfe3fc275b589aeb22e353f6
font_01_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 19240 bytes
SHA-256: 119f7f64b84e2c7db982cdc8f15ce769bb160c2d6dcf05ac0d44a0be15e3438b
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000131a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 10644 bytes
SHA-256: 8606133f2c21a6ab1bcc7034c3e9e2ae8983b5b2f1a452907b62c9a10fe54cee

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