Malicious PDF — malware analysis report

Static analysis result for SHA-256 03723540e268bd3f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 09:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a1091ca8cb2f0f15c13cfd7b6e30cad SHA-1: db4838b5114917ab1ba323fa88baaaef0100ff0e SHA-256: 03723540e268bd3f834d5e73cbbe58d9ca2b041bc32b01cf9ebad9770a2e227f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the presence of these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 https://crysiq.ru/uplcv?utm_term=engineering+metallurgy+by+kodgire+pdf PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6952264e2---rijaxiduw.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210607_051232.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ca68f4c2---46153994218.pdfIn PDF document text
    • http://charontrade.hu/data/file/14999337948.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdfcebaa0---pikomekopij.pdfIn PDF document text
    • https://edarky.net/data/file/nelutaloxinokewupok.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/72771796932.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/68251361917.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/pikirabuxufut.pdfIn PDF document text
    • https://mmszke.hu/files/file/27827326035.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbedc98cd3---45372216243.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/68999951686.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/66391052165.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fff4b2fc1---2898107572.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b727a3ecc0---96430674088.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/wovamewisufuzumafo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/latumunevivival.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/os6an8pbisgb2hsppcmm8phu8a/15646969925.pdfIn PDF document text
    • http://accronline.com/userfiles/file/wijojemenavulirowedes.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73589017087.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c691d79fc---luvuwataxajituzapikipiwa.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/24856400153.pdfIn PDF document text
    • http://podushka.by/files/files/bupuxevodul.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f00498b7ffb---68421115584.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/zijeliben.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e0c335f7f5125b2a197b088919d01786/merimab.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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 11104 bytes
SHA-256: 9d1e34353bfbc633bda5c88199155714f6c323242680e65afca396b69117a725
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 15836 bytes
SHA-256: e041ebe7eabb67d2e281118d930f361be821fd1d4a6d8cd231a414b0032d4d80

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