Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0c8b9be472e260…

MALICIOUS

PDF

75.9 KB Created: 2021-06-18 01:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1f91680c59611afc4ba9a4bb3652c7c8 SHA-1: 194f0de58d0eb9d7ee6d49b12e56404db1bb154e SHA-256: 9a0c8b9be472e26069483bff6d142ee7624a4410a814295478bb2b6f337ca87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sjbntjs9bkivjq0vo3fpsiat40/duputo.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a645b3a48c1---jirefivafod.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/47509004287.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/70506422b23d056d65000f4dd6722dd4/88915725486.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936b25aa8---fitexak.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ef3363a1836e6f2a39851ad86ffc874a/53247877283.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af6476e78---vosinikemobijewi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/78806883705.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cn9rm1e0d064uh1cmm28g4c35v/57069508354.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec78978486---kabonafega.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dd6410ccbb0184b01b0abd292b6ae31f/vamalixeruxema.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6198001b5a---2334884013.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f2ea1157---84461438019.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/nexixadoninur.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c6eb237050010731d6d1042276e91971/wunexake.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/20316306027.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/suximugogufe.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/68891300091.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc76c35cab---74407565806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sample+modified+block+style+letterPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5712 bytes
SHA-256: 134f2b926eca541a4f1f8dc8daffd0cc21707277e4bfe235f5c5994c707a14ff
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 10596 bytes
SHA-256: bf47959febc1de47ab8e55b73dbabec1dfa7b2c4d51abbeacea18153d39f8d15

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