Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80505d735bfe46e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 21:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e48fc7add1e51c167717b7b6cd0eb1a3 SHA-1: 8a68824914705a2b99b7eaafa9c0256c6e92c804 SHA-256: a80505d735bfe46e307a2356d7cb1edeb7d9afd85968b9b1187657ef531a599d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saltokisport.com/uploads/files/garujuxe.pdf In PDF document text
    • http://lexxyin.net/files/fckeditor/file/40884535976.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xabuduzowifidagedu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/12837097834.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vawonejigu.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/84146869704.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ed3135a4---nemegixamulokoxupixugixij.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/wotusizenonaruti.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/lojegibe.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/fifapekov.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/podorilixudekolajidesa.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/barejuvolameredal.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/93430600757.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/41654517705.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/15495549244.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/72129862023.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/61983625530.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/77590117613.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffdb9728f---xogonitonejikesisap.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/sapozoboxatirizufav.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/57606340008.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/33869239916.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/15349426638.pdfIn PDF document text
    • http://metallpress.ru/files/jedopeki.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1708b6d1b0e8f4fde343744a4425ca50/91751648582.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/divimeworopaxobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lady+and+the+tramp+2019+full+movie+free+onlinePDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11292 bytes
SHA-256: a6459334bf2bd07296159cb3615c19cc55c57a8221629aed47c7ea8eefb5e3ab
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17272 bytes
SHA-256: 5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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