Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9fed920c5dd45d…

MALICIOUS

PDF

114.3 KB Created: 2021-06-27 11:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f08939bea460f5a56d2acdd59b19d97c SHA-1: 8e095d0c83fd5e17e19a6a0105fb3949df59ca43 SHA-256: ea9fed920c5dd45de7bf9cc51034feb1d2c57d3b527fb955a66e092d3932cd58
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting further PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3fa0221f---31372709929.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b1841a9d439da3df6dd96c498b6b8752/45534221585.pdf
    • https://agronlogistics.com/userfiles/files/vuvikuwawovogakimovi.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/01bc3543ec2492426629ec9ee9f1b3a1/latepaduwodateri.pdf
    • http://infoegrafica.com/userfiles/files/pujolofimunatozamo.pdf
    • https://angkalaris.com/contents//files/20982515535.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/s17veplla95i2p8p3rsa3hrh8i/selulazefibeluvofo.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3471a392009b4215a0d6434671dfaf81/wowiwagajosupebupamigaba.pdf
    • http://highgaincomposites.com/img/file/2021621225720.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/6lgji9egfrc9j3vusf24i3por2/gitofuxaxanem.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb612363f4---wekuvosubali.pdf
    • http://wamer.org/userfiles/file/kasudajamem.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddd656f45---dalepajifivez.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d5d741ca---folididurojawoliditulekot.pdf
    • http://kibbkw.com/uploads/file/82239290563.pdf
    • https://happycolaborativo.com/uploads/files/96908488725.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a9032e51fb9243116522d2c7114cdad1/73459626301.pdf
    • http://imailbox.nl/images/uploadedimages/file/25624070064.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/saforamuruxoj.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65943a0fa3---19068225302.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96ad94824---xesapisewokelojored.pdf
    • http://alnadaoil.com/userfiles/file/88292713755.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=annals+of+agriculture
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157d5.bin
d2610bdb690f178b3fab0459230c88b0943718109088feb5c41dc5c3ce63cd75
pdf-font-stream PDF embedded font (sfnt) at offset 0x157D5 19736 bytes
font_01_sfnt_off00018be8.bin
b4409de2685a09a46615b0c6545b5921fccd03d4e6ac70a43f2cf359b9554f66
pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE8 10592 bytes
font_02_sfnt_off0001a451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A451 16792 bytes