Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57c3d25d36ba81f…

MALICIOUS

PDF

75.4 KB Created: 2021-08-07 16:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 243d179a6eac4f595fe9009bf64ec688 SHA-1: 281e29e0acfbaa65b2c24f2b6b4e80428d1b4238 SHA-256: d57c3d25d36ba81fe07cebeda62b0debacb39a2292e8dc26d66ca0f6fe78eb9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q6v0uuig8ssjs3jqj90kncq637/fenipot.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/65268339339.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749932c6306---dakubidulavifuputopar.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074c09057761---mebakapodujed.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/jivuk.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375086715---29984441168.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/1254437045.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4dfe804eb0464b1c04ecde9bb413b093/51674531327.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ef8dad83---rawutuf.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe665287e28---33133320765.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/abe15c6cf3db869a14dc6efd8b77560b/66585555203.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/woloxigeloxanovikejesegat.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iukl48vtn2fm3tet81o29gc8hd/6917515169.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/votuzowofetawolobawupexu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/58261017593.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/kaxuzusadezofiser.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b51ce68543bc0b963db00dec4c3245dd.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01de7bbcd---fadodilezomodatu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6226ea78b2---57508395536.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e6549e48686---68288277726.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/mabiseduguwuje.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51eb0cc5c22c7d3933fd446618998bcb/funikabebir.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/44778439846.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe3ab9079e---debirexisofamuxekurix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=abuela+invents+the+zero+analysisPDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 16396 bytes
SHA-256: af94a0ae1d73bdca2885d1f62c8fc6501838cb7e7812e115b18bee300b2c2013
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 10668 bytes
SHA-256: 03e8da14f4b1346fa9724e0961fcbcff1991314e80a45a81e1d1233fdb83e335
font_02_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1