Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03312c5a1807aa3…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 00:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 988e03f57a2b52c9835100c3a96ccb0a SHA-1: ef47856cec27956a535be7dca89bd93b0f008d05 SHA-256: e03312c5a1807aa31ba30fb688173c6de38fe22390e5b484058818827827e514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect users to potentially harmful websites.

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://cructi.ru/uplcv?utm_term=what+to+tell+about+myself+in+interview PDF link annotation
    • http://prestopc.it/upload/file/virikakos.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/kaxulifilututu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jnnebtljv7j12me3ac3icrtur3/48820748071.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9a69cf88---71750910797.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4342a8b38---12029345480.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f5d80dec---8881240489.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/53370c5a348c6c8957215a2fddcdcd69/xosuwujewe.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f276513d43---70304945805.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5784188f37---2562514754.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe4bf10f---kudere.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vimusujovem.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/24304752297.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/9515822042.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/midaluzoforakabe.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dekurotojolizo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/movopup.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pumepogeziv.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7i6q4ske34fmm38len82jae3sh/xafegawuxeg.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16092c761f24b6---70272130807.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774884f392b---rakogemilugoze.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210611_AEDE7EB09B609FB8.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a441d3e870a---ragodeb.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b46b596b587ccc480ccb0d61402e76ec/zijimiwakozejiroxi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607bded0e7b7a---xuxusejukifos.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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 17588 bytes
SHA-256: 8e885bee18bfa984c3c10fb0dbbaaac3ee023be131b134b451a8536b313a8731
font_01_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10980 bytes
SHA-256: 78fa629bfcab7544d3f5e8c9d7acbda41fa390f81b50b3ed16cccf08416e226a

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