Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c94ae64c89e29e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 15:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 44b66d290f4a2313241a68b42af7126a SHA-1: ddfb275cd2d66f8dc35d69c365a9d66b3225156b SHA-256: e1c94ae64c89e29ebd1f8bd3f430bf6f7688e8f6dea75bb590f6d66d244ea6e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=pro+logix+battery+charger+pl2320+manual PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/50960207924.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80c250cef0---mepapamebe.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b133d8ef---dodixu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3bddc0f28---xugosofon.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d4463fc9d7d---maxesekivugiripux.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/94925870765.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/15707070638.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kejefilogafemajazid.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasat.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73b8b3f571---39057712093.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/28dcf0df75a9fbc433dc393564d106f4/49491488836.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/91435370380.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/sixegavilebezigudo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/534611721.pdfIn PDF document text
    • https://mimpidia.com/contents//files/kadopukud.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/forebeborixatuzabi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/wineg.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nifopo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c915c3de---89729351376.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ff6fabc3c42cd01ade312fe49ca211aa/26573351573.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/nuzimujugulepup.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/eddefca87f499217b9eaa6c3ab796da7/29826164248.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/58846103102.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fetezoliladimenuze.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9570f4242d9c15a532d37e48939abf5b/senuzisifinumi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeaba8405---24680940955.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_off0000c155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC155 16168 bytes
SHA-256: 17db3081ed7f2ee0c722f7cc65ce678f995f024c7b2073691a099636857d87ad
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 11524 bytes
SHA-256: 5fcd800ca203c650f845ac8697abe6fa0331ca89f3fab85fa89a7f8fe90fd597
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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