Malicious PDF — malware analysis report

Static analysis result for SHA-256 2372ed3719b5bf58…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b518ec20e5b1aef4cc81fc242ce5e381 SHA-1: 3036dba2e6184373d0f8a978413989bc6285980f SHA-256: 2372ed3719b5bf58d78b35f5e597762791e7535c55287fb93ae8c00aea7ddd03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079a81c9bd53---4656435310.pdf
    • http://cermak-expo.cz/data/files/file/juroporakigidojizomugizez.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38c47d6b6---64605502421.pdf
    • https://5uempat.com/contents/files/27712335577.pdf
    • https://medicabg.com/uploads/wysiwyg/files/tutasozinifubobizugitus.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6fcd85cd9---91861165313.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c4f8cf0cd5bfe384c573efa1fa97e702/sixewipumoduzabatukoveze.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/35654449774.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074466f65ab8---45616575876.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210725022009.pdf
    • http://nakajima-ya.com/upload/save_image/files/6290905829.pdf
    • http://azizolace.cz/images/file/xofozuvezapelujewazato.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn9er0hopg6645mplljscnvasg/66376999657.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/84c2e0833d91c56e1a86555a4f1f7ae7/bakusuwimikovudopezekir.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b455937---netofebipuwosaxovadorik.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6f3fa11a1---46382233690.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/nazufadotoziv.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/77114013325.pdf
    • https://ceccarmehedinti.ro/userfiles/file/rumunodanigavasir.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289d71a667---96297067753.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/s7os2nubpj67a5acrdl8mqpvt4/jumune.pdf
    • https://benqmusicworkshop.com/fupload/file/lutajegofimeworukaxebo.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/patedizosedapoberejere.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/t9l9431posucchoudm4qe4k8f2/babukevetamitisizijeded.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76694851138.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/jadir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+write+a+progress+report+for+students+pdf
    • 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_off0000de89.bin
099d38a99ff76aec05d48baab58617549f5f613f6e7e586a51c4b1bc1e3a9967
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 17136 bytes
font_01_sfnt_off00010a23.bin
195fc59438cf73673333705967171f1f1bb152073c2a31e6f25f20e82a80e7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 10804 bytes
font_02_sfnt_off000122fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes