Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe26d355d5860fc…

MALICIOUS

PDF

169.9 KB Created: 2021-07-04 14:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d7028b43d5580cd89372895297563c6 SHA-1: c120dba885b028cb13430caabf63520d1825ecd3 SHA-256: dfe26d355d5860fc2e6daf88095a5ec842a96940fff72b9cd6fa33b9623012aa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or content-luring campaign. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://nomylo.ru/uplcv?utm_term=numerical+analysis+book+by+sastry+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3178321642---tutol.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nepevagutuzepovujewovikez.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/9019468673.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9s8the10rfrnc9djveesh73ml1/zanotazulipep.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc67848df2---14294516579.pdfIn PDF document text
    • https://davaocarrental.com/images/file/78744156822.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/9217968365.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/01bcc9816908372e2413e1574fd23ffb/44903981611.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a511ebcf---giverosadigivimimimupik.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607228cb23871---21805287246.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ffb784f15ef24b5b5bf9147c1b483dd2/jogulovidozotidinakugifi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0903bb21bca6c98c9c963fd5deece3d4/76695877316.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/woxekolevudasubebi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57bdc793---43747763786.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14926fd2e---jewakemakejil.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/85811545018.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/xisuwafubixijoxu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9nj5n49tg9sja8l4e08dkc4os3/fipakivopegafudovizaf.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7laotppqqf39hgav1earrbtnud/50575450641.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2207bf1212cfe3a562e66e30d9456df2/83576001187.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51631d3d5d---redadi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c4cb6e52---rerasumabasujavet.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b36188ef6---puzemezex.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_off00022989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22989 11204 bytes
SHA-256: be2e245c032e0d30c41253ac2ae4f2e00a3712c5e44aba024a9ea442155d7d1d
font_01_sfnt_off00024390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24390 22960 bytes
SHA-256: 12bc909e082c796fa4f49dee75ceb88ec7c403db049fd9f3cf6496d2f15604ac
font_02_sfnt_off000281ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x281CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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