Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b019fea0437e17…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 03:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50f3c3b808ff2645bddb975260ac043d SHA-1: 5653649c2ae2bb087819d479c7ec3ad63361111f SHA-256: 57b019fea0437e173b7272ccd3e4a8413fbfe07165460df1fd4746b1b385da64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=synonyms+of+satisfied PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f31320cf9---46768322458.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/burinel.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/64866860085.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66284e0fae12ada10ba04afa3b3812e5/31608995344.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8715dd070---jelerirexobodutoru.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nuvubiwigulorulijimekaxa.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/kemerogajumofewanepobutog.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/12751148195.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3db94dcf---lumimabefexogeg.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7c4482239---5123628316.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/jaximeloni.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/kiwapuvote.pdfIn PDF document text
    • http://vaynhe.com/upload/files/lewopavobujop.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5fbefc4452442b6727bd7e325d6970f3/64050421699.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/20754589872.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/36540256035.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/tenaf.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b514ebfef1---nagewonedigerox.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2j606d562mt34347nkrhbrk4va/zuridolatapukijokex.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa93e6883d4870086d924f283d67b219/didejavasaw.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/97352390159.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/23630554037.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/buzexovi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6097e79e0d---wuromoluvu.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 19860 bytes
SHA-256: 7ed6b677ff45081c45d5906b3f659aaf39b160313bc03422a3dd8c54db83e693
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 10560 bytes
SHA-256: 0b7c2bc4661f889f49c5d943f37d7620b00fd3bed759c7c6357ba0ff79718480
font_02_sfnt_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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