Malicious PDF — malware analysis report

Static analysis result for SHA-256 f557fbd898f6dc6e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 19:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c9eb0909d170ea112458d55271f5988 SHA-1: 95c64beb44b3a733438777478ac6a15cf51a653b SHA-256: f557fbd898f6dc6eea99c7c9e8c4f9213b0a8cb754b4bdab3b0a5a17267087bf
176 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 a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=forecasting+techniques+with+examples+pdf PDF link annotation
    • http://crescentcarpets.com/userfiles/file/babidusegijitopufiro.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf5708ff4c---93413869716.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0735b34d---dabudaworifezoviru.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/84942280143.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/damewepexijorunen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d89214d0942---22312169679.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/navuvowoxetudixud.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zewozawa.pdfIn PDF document text
    • http://zerosquareonline.com/file/salibinigazuwa.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/61197920503.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/kipalajububuzixi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160706c8902e99---67911870884.pdfPDF link annotation
    • https://newtech-utm.pl/userfiles/file/kivujitazijivejubujirer.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/24378487823.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1236551118---nimutenamaradizitaletig.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e36d0764d877a20bf055663b1f42eedf/minogoga.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/81874420824.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/zukifasetubobiwag.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ac8699a5---383139164.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a045f166e---bijopedetujizelopexiw.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816f205c1f0---46598072732.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/51549870473.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/95e20fbcde28c2efe10c958be0ecd86d/77651917650.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/021813266205.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215301217394360.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc7bef835---powez.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/xigakubalumanetejej.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078898c9460c---lutuwe.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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 11476 bytes
SHA-256: b7a311a98b7894065a94824e9dc9d2f7c5afaf7a9d02ae9aa884737823cfdffc
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 17648 bytes
SHA-256: 131db11152b65ba89933c5c0c32d6e1f661e5ab49acfc625608ec86f1fdbd17a
font_02_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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