Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08e1af42f5a20b5…

MALICIOUS

PDF

140.3 KB Created: 2021-07-02 20:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31ae14e382308b8e519c26fdef8ac5a0 SHA-1: 98ff3d4e02734158be5c60d958c082a5d60ca0d8 SHA-256: a08e1af42f5a20b5641a9bc4884d23ea1ffc20a4cbb59583f326d7abe0ceea2e
216 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery secrets or private keys. Numerous external URLs are present, many pointing to compromised CMS upload storage or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://irlanc.ru/uplcv?utm_term=cnss+instruction+4009 PDF link annotation
    • http://giasuthanhdat.vn/Images_upload/files/30206791920.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sigopovurogewikemunad.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9bcda466de13dbcff75dd907af74bc92/36012587609.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736a16591e8---zowovogemebemisamiw.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k2cvq03m28u16ki7g6sps6ids2/selefalogasuneva.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tawuzegademovatuzosogura.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/od0n81s2pja5k48oud3g6sel16/6283433466.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a586e960---vuxusakuri.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j8tmp969e2jo2qgqrlnqak7j6t/bujumikubovuvibonapugixem.pdfIn PDF document text
    • http://roocenter.ru/upload/file/pewukabogojumibifudarexa.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1289a1e8---vulaperurofebixegokuk.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/5149917042.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608804ffcfb47---xutanagitoluzumasugufemol.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gugexuwojufapi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb0e4b332---36066877316.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b35f8a0a5e363a1c3e9ae9b561077dde/wotamasupun.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef4b2319b---dovosezomizegamisukajas.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/26860599515.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f69b659df---18749880491.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595ddad6d1---94589693229.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/28511338111.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/pebigedasikowa.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/67462621263.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bdc94c310---jusezejovisotababiju.pdfIn PDF document text
    • https://reniuved.it/file/47426844436.pdfIn PDF document text
    • https://discoverthesky.it/file/24744906898.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_off0001c4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4E4 17304 bytes
SHA-256: 4f82fcdda4acdb65374c8906aec2bd11a65dc6a9322256456f619e18bd95cb69
font_01_sfnt_off0001f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A0C 10384 bytes
SHA-256: e8f99351be565c73fa2adacedd60a8624a4360caee2ed11aea76c67267715102

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