Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af76d3e9352793c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 06:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7933d73a478331cd5aa6cb3ad2a8d3d0 SHA-1: 0b5050063dc5dbf235dcefbb264a3688253a1bee SHA-256: 7af76d3e9352793c4e1628d19834b7bf72cfc181e38719e53c2ac2c14dad2ebf
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites acting as a link farm. The presence of invoice or payment language suggests a lure to trick users into downloading malicious content, likely facilitated by the embedded JavaScript which could be used to exploit vulnerabilities or redirect to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=form+no+49b+in+excel+format PDF link annotation
    • https://cosplay-expo.it/ckfinder/userfiles/files/15955860997.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/1232324803.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/guzapureduwakutomukekob.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beb842782---pizibivukimadotowax.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kixijexevejes.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/efbb8b51ad191850539037b8f74b6342/melekapenere.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/80836788091.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/65884404790.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9b7c2a30878d1dff63b9a9982efa3a0f/55409887339.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gpd8vcud7u5grnc1auv3vcqlq6/44363697967.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/55247606253.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/85223501904.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/v1lp82iphok2g50lqtru565e33/mubimisodibopirirajuk.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082eef23b214---14797332658.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/zumoxuti.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/707cb2411de4b3d19d06defef2d30531/64522201670.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db6499a75---lefoluweja.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/giranapojefexur.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1g2rkeaecva3ff399ubt6ijigj/bejuzuzepofewunujatax.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47032727312.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed57f72e92---28448942213.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10796 bytes
SHA-256: c14d14115f7e2fcf3f4f0528e0745e488cd3e6a14882181b7e737f07b1ced877
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 19352 bytes
SHA-256: bac4d90041dde21782efe590f5b1d199e3599ab015a96bdd8ee53df0b3ad8af5
font_02_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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