Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b6d55ca767fc3…

MALICIOUS

PDF

97.4 KB Created: 2021-08-06 08:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6520fb56485abff27466ebe523529b7 SHA-1: 263978a521933e7d13ddf6c7c2f3235b0bfff09d SHA-256: e83b6d55ca767fc343cb1e7d3009c7c3167dabd5d37c10a5220f9ea0038e3745
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/afa48cf47958582c37e18e3d9d603165/wudelor.pdf
    • http://qlionshousing.ca/userfiles/file/pagofit.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7cb5d928---78268921726.pdf
    • http://martom24.pl/martom/userfiles/file/2558699693.pdf
    • http://ateliergermain.net/sites/default/files/file/poxon.pdf
    • https://alariel.be/userfiles/file/53757865822.pdf
    • http://adance0112.com/upfile/editor/file/74392086188.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/lojutib.pdf
    • https://abugfreemind.com/userfiles/file/tugodab.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574ae13ab---xebanuxoxavogetexule.pdf
    • http://ilturismoinitalia.it/userfiles/files/83441193078.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/53379099915.pdf
    • http://gmkms.net/upfile_editor/2021/files/51834559766.pdf
    • http://alnoorcity.com/userfiles/file/93777884963.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/h7odu9h5j7f8vntlh1lcovggfd/78562161442.pdf
    • http://paliukenas.lt/i/File/nofatozutavujalopajiruv.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/86736f4deeec73d2fc3676c979bd48e0/79235714089.pdf
    • https://chupwo.com/editor_upload/file/49139864705.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/763e2365a6684e0fd7e0a9e9999a6352/sosiwemanux.pdf
    • https://telorgabus.com/contents//files/wawuxoxalilesizox.pdf
    • http://metafelix.it/userfiles/files/35311047977.pdf
    • http://oilandgaswork.com/userfiles/file/mosarokibubenimewa.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210728_247AA346F753E338.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=guild+wars+2+build+guide
    • 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_off00011691.bin
210948e080be3b84afbb28cb7885fc6f9b5a02c0a703d88c0dabf53ea80ddb45
pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 10584 bytes
font_01_sfnt_off00012ebb.bin
d876f2e98e3ef38d93aaa98f80028c7dbd29fec5f4ff9cc47038950217efb6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 18588 bytes
font_02_sfnt_off00015fd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD1 16792 bytes