Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fa4fa978934035…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6cfea9eaed395ad153541d63a3c3806 SHA-1: baa22ec22490a3f8feaa5fc041ba64f3168bd36a SHA-256: d7fa4fa97893403578f988a59c1068aff1f1621b7b43183504feb2729d77302d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting. ClamAV also detected this file as 'Pdf.Phishing.Trojan', suggesting a malicious intent to lure users to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=via+android+app PDF link annotation
    • https://ccar.host168.com/data/fckeditor/files/loterigesisujevatugewuw.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/55600669991.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99eb3e6238eb17a94d1b46655b977081/92551201037.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kuxaso.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vepewolaripeguwade.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/16839337082.pdfIn PDF document text
    • http://bjjiffy.com/upload/37439743078.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/30383826136.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/88356113851.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/xozekalavukifewijanivav.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275eea9c3e---7445308113.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/3699837132.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/legutimu.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nenosojuzibaxiwazuketa.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/jovapezafupifijo.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/jurenarifepewalevazu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/dazobelej.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vuwobexefebuzali.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3fe7b1e19ae9e9455c821b4be9444861/25675558736.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rupukadefosoliwata.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/naxilowinumedaju.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/22766892058.pdfIn PDF document text
    • http://cjatkinson.com/userimages/94408129085.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_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 9912 bytes
SHA-256: 1f891742466a7da30e0ee2fbe04e0d22058a524548dd7292a70b9c4f6dfd7282
font_02_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 15460 bytes
SHA-256: a2bf94e0758657ed01e7d7ae442c770bbd61c65ffa17fa8ef1ee5e24e49cffb3