Malicious PDF — malware analysis report

Static analysis result for SHA-256 079b1bd2f03ed0ae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 17a8b82be4a01a66e3f53a0395c82840 SHA-1: 69d28535521388f03e9f01ab4c9d3718b2b21c53 SHA-256: 079b1bd2f03ed0ae9be56efd49150c1cdb036a8bc768ceaba2b1f228e483ad49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous URLs, many hosted on what appear to be compromised WordPress sites or disposable domains, strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=android+usb+tethering+windows+7+driver PDF link annotation
    • http://webspace.mysdam.net/images/newsletter/files/34985032099.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/sedevidevepezaned.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/14260684364.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/33059761267.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613772bd62f2b---gavuzuwitixodilor.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/78883798875.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/24579494130.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e9134d74---17385130150.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/88333764141.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/30697403328.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/morazarimatawizetu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/37947754458.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/wowemokujufevojot.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/ziluda.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/33113260266.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/megenitigawow.pdfIn PDF document text
    • http://qdjshg.com/files/file/31194108109.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161387028cd8b5---tirunejavatoratorikikir.pdfIn PDF document text
    • https://laser123.com/geektic/files/wotemezerasufisetusamita.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109060402267463.pdfIn PDF document text
    • http://kechengchem.com/upload/files/votopeg.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/19846978682.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9ba78a448ecf7a876759a806b13c2dca/tobipure.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 17744 bytes
SHA-256: aeb9e3205603c29f28d8b927974816de361c3025d850c5db5521ecf80a47d017
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10744 bytes
SHA-256: 7acf927b953915645bc6570fd24565cbbc94c152f1a54060138bb36b38c600aa