Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d912db846f6b99c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 16:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 07fd814e4a6bc1f2ef9ad58c979359be SHA-1: 9c1d9a3f9fdb5473df16b1ad91e035a5dca4593f SHA-256: 6d912db846f6b99c8455a62965d41b661efb59db28eb541570b6d7d35e88658a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=toyota+tacoma+2014+user+manual PDF link annotation
    • https://smartcirclegroup.com/userfiles/file/54065897973.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc3bf2db4e---72081384624.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tuzipogefotazas.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/43634639054.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210615183734.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/77993387596.pdfIn PDF document text
    • https://777mto.com/contents//files/33099203497.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hmjsj6qd4c168uj8as0kst4dnv/15523165863.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3908ce4b9---58341783539.pdfIn PDF document text
    • http://cosyromania.com/media/file/guxetu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1eab822f4---66030775610.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/32971750044.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/54185670508.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sesavudavojawulebemogafer.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e4704d19---19306385994.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb37d5f63---mezenezozo.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/305772795.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/befabaxeme.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/14563893308.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wivup.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/54245955078.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/64829425366.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501001052748564.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baefec48edf---kibebugupo.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/32033273102.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 10848 bytes
SHA-256: c6c08c1387668c9345b4461f769639155cbc192becd1f13538ed26f78d5f77fd
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 17040 bytes
SHA-256: 1e064b605693e95fcea1bba7e82c9b71a9cbcad99c7a0994758f6a9f12066c28
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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