Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f9d936dff1703…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 258cefc96c988547b06225fbd9438ad4 SHA-1: 64e7641cddf16ace794d866dbfb47f711ffde2c5 SHA-256: 925f9d936dff1703042e83407f6d5cf43bc8a2909457e8b3e30f1cab52968544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://afgventuregroup.com/cfiles/file/tedetabopewumilosizup.pdf In PDF document text
    • http://healthywithhart.com/res/file/24114236957.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/taligokodilosapiruwaw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1c5b4116149304b68dc0d4b8556fdece/67800502954.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/90056544493.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/95476653667.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/56156554660.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/81192220040.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0f8d44e0---41855606596.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614916191a9a7---nifojefuboganamuter.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/19821877030.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/48768666320.pdfIn PDF document text
    • https://denimder.org/resimler/files/54868469607.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/24801942870.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/84900828431.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gthmkd2gitpklqe637sinc5ok1/90802643559.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xibadazomovelifalevab.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/domamadapijowilutibugozo.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/82425791104.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/45210379740.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/movopijuzekevodalabumis.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/neserisolipowupu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146993216030---wukobapurukag.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/84089524811.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5mcltg57j8a5279ac7a8cdki0u/kafogakafatak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+regionPDF 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_off0000b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 14832 bytes
SHA-256: 9317ffd322f96b36764a3828000a522005a83513d67dd258079563161a240408
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10400 bytes
SHA-256: e9bbb304ccdb9b8483da12f2f4e04a67463bc7bdfd95c3d0430523ce27163c18