Malicious PDF — malware analysis report

Static analysis result for SHA-256 57629c3def84f913…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7facefee55119a704960b7d7ff453388 SHA-1: 1bc0d0f67e87cc39f6198dae3b51813bff2fa0d6 SHA-256: 57629c3def84f91333443ce01d4f01dadaf13f7065577524430ceed80366d153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware distribution attempt. It contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with spearphishing attachments used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=the+end+of+average+pdf+free PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rbtg6bk9qllu17euebpd0ekocs/luligitigo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36cf35002---xijoworugilimasijideko.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/35e56379b076a99f67867f3021e99234/98507742837.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/loxilamedimamem.pdfIn PDF document text
    • http://szpk.hu/_user/file/43336335964.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mabagakawopixaxaw.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8df53f0071---35373452144.pdfIn PDF document text
    • http://greenbrier101.com/userimages/150376047.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/redokuduzobawepebonuresu.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/lunareridadonutelezuta.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588086643a---dijeveru.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cc6c50d8---rosije.pdfIn PDF document text
    • https://123natura.com/stockages/files/28296162403.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ah5fpenvfjl6iss8181ahtmah8/21904015090.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2b43d581---58900579253.pdfIn PDF document text
    • https://p87.hu/files/71704279307.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/sugefejotiri.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/998dd0e1b457c4762ea1368850c8343d/76494470325.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zovifavubaw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f49eaf67---34233941465.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5d7f29b3---nosavimepo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/59e102d8f5a1b512ae344772cb72f1d1/bifowasofatonufir.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_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10404 bytes
SHA-256: fc5375db9288dbd5ebfb830ae7b2f9bf141fdc275cbb75e5c07d471ce9cf5211
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 17112 bytes
SHA-256: 0a3b049ecdd9993d8fcd8ca4d079bd755a9854fbe428e93ffd2978f52c5fb922
font_02_sfnt_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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