Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa58ca2dca41e7a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 06:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c29730e679b39909e9730b2f651a711 SHA-1: 90c39e176498661265534ba8952b961288016aef SHA-256: dfa58ca2dca41e7ac9884f85e4967e5611f31e21c8a4bcdcd153abadc0208d02
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://trufeel.com/ckeditor/ckfinder/uploadfile/files/96086037495.pdf In PDF document text
    • http://milkyway-vn.com/upload/files/xirovawibefoxezedaga.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/12897796312.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631294578.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/tatusadoxibax.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/34205426840.pdfIn PDF document text
    • http://tzsunup.com/upload/2320014623.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366bb90f579---sidipofuvopufekivuvadadu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jodabisumizi.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_152805.pdfPDF link annotation
    • http://www.rpv-drachten.nl/files/file/kupokogonorijegoxugog.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/miforeritibogapowudesume.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ffb21c8---51617039195.pdfIn PDF document text
    • http://geotersrl.it/file/97694269046.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c9abdf41d52ab79751fe23eadd60084d/98770015849.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/nubuxepelozivexokises.pdfIn PDF document text
    • https://partetesal.ir/data/file/43416534660.pdfIn PDF document text
    • https://cmf8.ir/data/file/45457717351.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/41373909722.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lifolezilaxigovedod.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kijabinimofur.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/miwibotoleposa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+book+of+thoth+original+pdfPDF 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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 16304 bytes
SHA-256: 71f18eb5ef1dfada8c250ef2f000ffeb778cb2c85cc5215873c920c2690f4713
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 10804 bytes
SHA-256: 39bf58b1f0086ef1425b7412cfc74009eaa8ba39d5f12285d15fa49f51ab2c10

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