Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a56f2e07f35785…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 664ee5824ef661278bb34ef54024fb4a SHA-1: 2fa00e07106f15cedb41f9047870e05339c83fed SHA-256: 39a56f2e07f3578506b3f514912e7e1d9f611a3e745f1b145d70fe9aa8edf5d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload storage, indicating an attempt to redirect users to malicious content. The embedded JavaScript stream further suggests malicious intent, likely to facilitate the download or execution of a second-stage payload. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393d07e999f---lafujofesaniwigigizifuru.pdf In PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/kevojiwimepote.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/33295465753.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/mipeloniraxibi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac111b6e9---tizebuzegenonuzedaz.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/54762276420.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xegikopufulagoba.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/dibedomirove.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210915164719.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/689621885c1ca3feb9708471426176b2/bitolixuku.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/22654981713.pdfIn PDF document text
    • http://budka39.ru/files/54016711741.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614208c31a45e---kamepabomaf.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fejozaxexudixete.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/rixakovimuzimedinajew.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/42331482173.pdfIn PDF document text
    • http://njchemland.com/upload/files/xujugepuvafifi.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/fasorodit.pdfIn PDF document text
    • https://semut73.com/contents/files/71854539529.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/16518365874.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zukedegome.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/78600487829.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/wavekajig.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/16000873985.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/71566024474.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73275429349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=smarter+iptv+proPDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10236 bytes
SHA-256: 4db43c99620a52ad742b603de7cf97f05050f970f2f43e1ab4768094f0a65ca8
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 18540 bytes
SHA-256: 69642b41b6fc02c0f83b7e81a0166e8d3246333682e6d78461ce784a5a1910d8
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1