Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b87285a581fc6f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 20:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5f60f5025f164eb4b184f55984d33a1 SHA-1: ed14e069326b6e796ec547da291759b3ebf1feca SHA-256: f3b87285a581fc6fd16da06fe95b39bc869c301dec0828aa5ac483c38a553ad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download' button lure further supports this malicious intent. Although no scripts were directly extracted, the PDF structure and extensive link farm indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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 https://drafthe.ru/uplcv?utm_term=general+awareness+notes+pdf+download PDF link annotation
    • http://learningkey.org/userfiles/kijolojurikigaluwetatukal.pdfIn PDF document text
    • http://tid.vn/upload/files/57184601567.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/pusodedatukatexagajakaro.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aecd942adaba36b426dd80be70450312/42905234376.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/remodeduzim.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d96b998b0---ravazusubewuv.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd1932d08---zomagagabonosukuteve.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/8191571698.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb6f142518---88911354476.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/61688678722.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/41201805607.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd41ae109b---62464423545.pdfIn PDF document text
    • http://cy2hand.com/userfiles/timarimewadabigiz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nbo15bep653a8vq4e2qi5d2p1v/tovuvemebutetubopobasak.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/28653482592.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/24c4e51ab2262667fb812aa05192ef2e/kizesawoxegekunukixebuxow.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/57647390724.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09596b99fe---65584919953.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/raxoralokuzalevuza.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdab5fa04---57434510030.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/domekimenowojopezegutezex.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/povapegogogusemulenikomo.pdfIn PDF document text
    • http://hotstamping.pl/files/file/konilu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/310704536395.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/pifubukoxiz.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c831f52b11---4931066546.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 10524 bytes
SHA-256: cde0f4952062cb4bb2eb42e828906c4347626379f34c6f04bbd3d4acde5dac4e
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17348 bytes
SHA-256: 9a3aa0fe8542fe068014b2c1128df26d478ffa232a8dc5fd1256086d7a24472b
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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