Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7e60080f25d0aa…

MALICIOUS

PDF

106.1 KB Created: 2021-07-04 01:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 824e389953ead46d8f5913973274bfe3 SHA-1: 2e515d5e75275719fc0afb055479855c968a3c87 SHA-256: 4a7e60080f25d0aad92d2fa6179303fc56dfe2cba09ccb9c60c465f6c8d9b2cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4d23554bddc54124afd55c4ec0fb1ca2/buluzevibog.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/dd5cf1de03b4388784366a828d9645c5/56861991184.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e6f91950e0d4c1161b0390d97faf771a/24462603683.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d8601e93b4d---vunogefetuwu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc754b546e---bunifilelozuxatimog.pdf
    • http://coffee33.ru/archive/file/25713028693.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2aae0e1a---71297215649.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5787c842---jidowola.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ch5a2adfgp873utifvp4sg2td7/vivav.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2d6de4869fe12dad1d7a49c1565ce4aa/11175997245.pdf
    • https://toolsatool.com/userfiles/files/19133754931.pdf
    • http://zonazero.es/userfiles/file/9780605381.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/35c0748e6aee81b9b97cb005323122ce/43856038281.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/987a5bfce2bde0636dd42bb4089078dd/73891202273.pdf
    • https://krassimirtaskov.com/userfiles/files/tegawudurozigedekikugob.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6f36145---57037387026.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1df3e75c09---15758861827.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5dh30kq05rds7komvhtnc8jvpi/nepupixiwexiruxujexeware.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/63083274896.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/sepovudak.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820ea47e6be.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=agree+meaning+in+tamil
    • 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_off000140f7.bin
fce7ced9aefa1b46424da083ec13fbb403ddd521425eb07ad07ef6a20e421946
pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 16676 bytes
font_01_sfnt_off00016cbc.bin
f09721fa46b0ef6b50801c4a0a492df7db6cf86f25b11af157211b65e008fc16
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBC 10144 bytes
font_02_sfnt_off0001835c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1835C 16792 bytes