Malicious PDF — malware analysis report

Static analysis result for SHA-256 78727271add4f3b2…

MALICIOUS

PDF

82.3 KB Created: 2021-10-13 19:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cbdf0ea9e95b9484fe44c8bdf8526839 SHA-1: c749150982de7a4746c0640039ec361dd11faf23 SHA-256: 78727271add4f3b2f6953621b054bd1b299ae146bee35e6589d1aa9b5f3854f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://garglob.ru/uplcv?utm_term=purge+in+meaning PDF link annotation
    • http://biometria.pl/photos_fck/file/64317589293.pdfIn PDF document text
    • http://uchid.com/uploads/file/fabarovo.pdfIn PDF document text
    • http://harlit.com/upfiles/file/wafovir.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ff132f9b99d4593dc410bed506450b0c/15640215382.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/ratox.pdfIn PDF document text
    • http://vhshf.de/File/12995851265.pdfIn PDF document text
    • https://palet-school.com/files/files/rowepetolojefibef.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/19368742535.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/49131639839.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c918c41c7e---2475927410.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/51351360512.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615343b906e36---8798071719.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/bunogixifixasi.pdfIn PDF document text
    • http://195exim.com/datas/files/pavik.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/94226547789.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/24149a677ce5c70b00c8316861986902/47250693711.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wemixevavorujijiligedup.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/xikajixatiba.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136561fb8f3d---dovedu.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lafufupexojematilururuzi.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/mutujibug.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/98265528837.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/tugewaledu.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/26050055241.pdfIn PDF document text
    • https://777mto.info/contents/files/50253432557.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 10120 bytes
SHA-256: 35760e4d4c099458aa477cc3e0d091e05771bb7cc57df47058a09463993b327a
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 20892 bytes
SHA-256: 7280a657dd23e60a8b88bdd180452940acd7be0c4f378150449b7127f9079e42
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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