Malicious PDF — malware analysis report

Static analysis result for SHA-256 f911f78849ca30ba…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 22:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab1d981973ba61001af521da72fd4c06 SHA-1: e8e08d90171c0266ac58bb6fb71ce44a3c3d2849 SHA-256: f911f78849ca30baad3fccc2dd4a43624bc51b10a58d270a44eb1eba7cfa3e93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The presence of 'compromised_cms_upload_links' and 'disposable_hosting' heuristics indicates a pattern of using compromised or low-reputation infrastructure for distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=functional+group+test+class+12+pdf PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/54341306453.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c93f8d8ca---rebiwuvijisedufan.pdfIn PDF document text
    • https://combrooncom.com/contents/files/bogesujoxinomunun.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/20666582644.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/nukuja.pdfIn PDF document text
    • http://gibisch.info/files/files/dukazuta.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e185e691---47679720589.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/1719886412.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • https://timminsrenovations.ca/file/vN6S7U3qt6peZb3i.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/tefavamigebugeponu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918032318.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/85397832576.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/nezubok.pdfIn PDF document text
    • https://turbooto.vn/upload/files/denefebelobag.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ravumaleduwipedanet.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/rolorozosazemebizamoli.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/60399588408.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///46384760465.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/47857314359.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352303aacc4---9642238408.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/90518761292.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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 17296 bytes
SHA-256: 11da3097dbb0181949e8fad59cd4ab7f75ddcd2adc2fd3e01f930192f013f41a
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 11044 bytes
SHA-256: c1c95da5a4a43be41db31df890b860f5b2c9ff215a557057a63dfafddbc657a6

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