Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e01281892d4e139…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 00:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f7850ae1dcadd7c9dc6a5bdb2ca1199 SHA-1: b8f251ad6753d521529e398dc8b9b6ae84156ef7 SHA-256: 4e01281892d4e139fbcd901dedc77805002b4ed9c2dd4e76ef975356352be89b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=litmatch+unbanned+apk PDF link annotation
    • http://ciba.lv/uploaded/file/vipomexufuxizurefumav.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/60220005663.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/88415887696.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/91c3c73b96f07326589b0f6358a33b2e/fajifuxurepaf.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/22052547228.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/revajibajiken.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/93523874551.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/wojosam.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6f29f844c47f4f8c57d58194972fdc7a/segisalojirefum.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/19145154533.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pudukibimozal.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/70733927839.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70722873---14006468131.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/78404016526.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nokejaw.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/mavodanosatosa.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/70222223030.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62092377479.pdfIn PDF document text
    • https://camelcarpet.org/d/files/46451957591.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/34981911308.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/mobosewojirerav.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/xezetofuxepojajizuk.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/88250088721.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75134540651.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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 10636 bytes
SHA-256: a2be8fb86f049c1ff76777b2c5ebeab7652b3aaec1aa45874dc6a8f7b99585bc
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 15956 bytes
SHA-256: 651ffce4e0cba891f503c19915cce885b8b1f8c019e877ebd4399436abc76b7f

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