Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4e14486f9b6b74…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 02:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d8e776fce9725f674e0e939a30081da SHA-1: a13f630164befc5f2c3ce4a6aeb4dd3ffd69e36e SHA-256: db4e14486f9b6b747ad86354fa5126ba347b0af89ea1d0f28bf43dcd521b5b09
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of a link farm suggests an attempt to direct users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/vogonejuguvuv.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3gcnpa53ebol4a2cvrend4ls57/kekoke.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/50733162765.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/90799279024.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8g7ru76fndin4ocbolpsn0mt32/3466129534.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/54841491868.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/67238841895.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nuwuzizi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4dbd9ac94---dukixijonidi.pdfIn PDF document text
    • http://apple888.vn/luutru/files/65227106906.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a153f3309bd---97444345843.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hd248tl12jisu3amohpbgkpj15/33542985831.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/64532256224.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210611001825811.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161040c11449d5---diwojipalumatezexur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4984e47932---mubizekenawiguza.pdfIn PDF document text
    • https://hirurgija.me//files/51116787702.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/73308320044.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f05ae97d005---makiguvewa.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/tuvelefetinegilor.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/susijo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b0850dc4002---fimuwidazukab.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xutisivubozobirimet.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jafaxerejevar.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae1520656---48037753417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=charlotte+hornets+schedule+pdfPDF 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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16632 bytes
SHA-256: b3228bbba041bf3fe37ccd6e334351381dfb995eb2f662ec092f7bad71724c8f
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10756 bytes
SHA-256: b9ed9a2e8633bcb9a6a043a6e2a698fa2eb82ab944e0fc00d26cbab2300777b0

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