Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d258015e43063c…

MALICIOUS

PDF

118.8 KB Created: 2021-07-25 21:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e086249ebc03b2e38b531e619174b8ea SHA-1: ed83919fd05c6f462b81c75926a430d4d7a226d1 SHA-256: 24d258015e43063c203664557a78f9335695867a0f9ca64865da8a027395e292
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/28995815697.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebbcc36c69---63758251676.pdfIn PDF document text
    • https://ancoraeducacion.com/images/senavinur.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/2368721308.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/xoroxumop.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3pe7nshfv36lrphkppa8sj5g65/28436722937.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/27099574916.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ab329dd9d00---ledokagelenimi.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/xajolutomip.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94abe17442---18150469753.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wisuguvivogifuz.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e1128f76---xizetajodafivov.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/15029972491.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6c91e5560bbd98ec0d49db131ac9fc52/pumepudibedapobutetex.pdfIn PDF document text
    • https://bonacorsi.it/file/fabariwogujubemufofukuk.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zupixefuguvumutelopog.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jikilab.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vt3ivgdcu163a4csblmq77hh2j/sizete.pdfIn PDF document text
    • http://feg.vn/uploads/files/rusovozemanige.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/79570da6fa3622c8b262a79b4f56e2ad/zanilapapifesoxi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/10841468087.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b536648c---rojuvuxadirufizefemibiwi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a0ac9eb1---dowenixekud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+aplikasi+facetune+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016c6b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C6B 23604 bytes
SHA-256: 07d531f17a116f99aec9d739f32a289baa8d87a9b070f4a742b7cf4e0ea772cc
font_00_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 10892 bytes
SHA-256: 87d8e2c808a1b7cde48cdf10230788544f15246f0eedde7225d83d4ac48e034a
font_01_sfnt_off0001545a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19690 21232 bytes
SHA-256: 89c7224edb9a808d8415d96e251ff032ecfb4ed89b064d0aad05b2d4536b533a