Malicious PDF — malware analysis report

Static analysis result for SHA-256 905fe35eac90c434…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 14:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9e5168794584964475a2e034fec23c37 SHA-1: cd0fe53bdafa92a125b1c12588609425d7927a4c SHA-256: 905fe35eac90c43421e5b8f719bcc63b9a23bd49fd5be9fc33eb71febdfc8934
176 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 0.9977

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
  • 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 http://roberlo.cz/www/files/file/81212480523.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0f872628---zifesu.pdfPDF link annotation
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/nixuxubunewilegidi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/36875751679.pdfIn PDF document text
    • http://bwc.lt/i/zalapawebib.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pkbg62mducvroltirqd7m2lu2k/pajojefekuxokuga.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bd2803ef---jifixugu.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/9460253776.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f0d76c09---vatujupopamifejosoguvi.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/mumifusikulu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d3bb014ff7761f68c9ff9a753dadca88/98911789640.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/buduvago.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/81c9370ab435707808ccf92a1af04907/kixixus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f1411004---34365908535.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f2b736742e859eb6b96c64433c041904/lojawuxifujitibi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0662ea3ba992693021a3b77977aea4ad/piwodewukidukivukujisonix.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1238ff0b---48765340558.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/pasimemalazubo.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/tadotulebidelof.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/11b2e58830d1b1cbddb5026374223467/35085770490.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/pugad.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/49364887212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fact+vs+opinion+worksheetsPDF link annotation
    • 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10644 bytes
SHA-256: cc930ede3d3db3991f9e09474789824145cfea965d24ebc62e327e1f560a02fa
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 18016 bytes
SHA-256: 2941371b460fe3eed0bc9d2e6bf8d0f21b0e1067d30347fde0ba0a4d60507f5a
font_02_sfnt_off0001250f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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