Malicious PDF — malware analysis report

Static analysis result for SHA-256 578fe024fc8bb01b…

MALICIOUS

PDF

101.7 KB Created: 2021-08-02 00:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a23d0c8447676317000989bffd33a6ab SHA-1: 3295e5a40b44c7a78576baef5a9c376011c02540 SHA-256: 578fe024fc8bb01bfef56136e95eb2ef913d5999a018eea1f2ec78a9878af1f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or downloads. The presence of link farm heuristics further supports its role as a distribution mechanism for potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=helium+premium+apk+full PDF link annotation
    • http://protok.pro/upload/files/fugilujowogamolalapiwi.pdfIn PDF document text
    • https://activepymes.com/pub/file/40653482667.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077128bdb6bd---tudomojod.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da83ed0c9---16334608581.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pulivaxe.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/82359789770.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcb0c3e40---winikefasitodagesokulavi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pudg6a63b8svp9lbmfd5e7r8d3/47863421324.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/003dad0011b9947a75d1921efcdbc2e4/93922695185.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lf64qus1imghma3fjmo6avrtn3/29767840496.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a8556fe19a9---kuravowulibeja.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/susut.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rivenalixaso.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/44a0b232a6aa2a6b06c8c0e72c4f0a41/xemurezodasini.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/dirigitomizujela.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608404cba34fd---kavemasodozometar.pdfIn PDF document text
    • http://vinmexindia.com/uploads/zekom.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/sazelujujoneso.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/13456421461.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/danexugomexoligiv.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/gijixa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1aa56b76---92610830932.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000141ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141AD 25608 bytes
SHA-256: 5c04fce31df9cab129d0a179b18a1a747af0986d43e2e9cde458c58a41ab52e3
font_00_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10212 bytes
SHA-256: 1b69c2cdac1dff5cc83b01e02acef5a91fe93e3a919d07fdeee9e2c629b70c97
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 17476 bytes
SHA-256: 4de1f701ee8bb37606a38694e55ff12322a5b4354293b74f2a72e46d26e75fde
font_03_sfnt_off00017046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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