Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7d679e70d26434…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 10:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e6b6a34b6f91850372b06addd9f20d6 SHA-1: 312274a2013f2838cac2544cfe7dbaaa4e0bc8c7 SHA-256: 9c7d679e70d26434d26a8b35dca0fffc60a0582592a5f7f90174d1e1e633e308
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple links to external sites, some of which are hosted on compromised CMS platforms or disposable hosting, and one specifically impersonates Amazon. The links do not match the impersonated brand, indicating a credential phishing attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+voyage+of+the+dawn+treader+questions+and+answers.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://harryreichert.de/uploaded_pics/News/file/98813990776.pdf In PDF document text
    • https://dialogueinpraxis.net/files/docs/bosaganivavurufawajekaban.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/97488969637.pdfIn PDF document text
    • http://kco.su/userfiles/file/23902850939.pdfIn PDF document text
    • http://iwishop.hu/file/tatumogazitosi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/7620364730.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/519701ca5a0b8692539419e02775aeb6/40445140242.pdfIn PDF document text
    • http://candientushinko.com/images/file/kegukobesokixo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/goramezirulufedepux.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848ca69163b---xixesijojelegigipuxozomi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fc629deb9---rezurakonavuzodizaxixiku.pdfIn PDF document text
    • https://lazerom.pro/media/file/pinemuzuvegogenavos.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210812015342.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/97847854770.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/72991390654.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/58hhfq4mspuplhg082cbk25bs7/jarabuvodageju.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61955010387.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/luwerivij.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/36090827334.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b7614953c---rebusizadadubadef.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/dukasimokuxa.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/linesajizanudasoranis.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/30760763599.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effd0821be---jikaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+voyage+of+the+dawn+treader+questions+and+answersPDF 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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 11064 bytes
SHA-256: 1c49cb1b775d844dda5cdedc687952de3c3e7090ca90f3c2b589d80a81fcc03a
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 17820 bytes
SHA-256: 999ab252c73599d10379052c29d600932a5064e720bd64dcb1529fab1941b300

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