Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f5f5335261a558…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 05:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc607478d02e4f3163613cae0f3e3082 SHA-1: 0437fa57b768631e8cb5bdd4f775a6c9f8410896 SHA-256: 62f5f5335261a5581d179501eab3729626fbff6e8cd6c924280c90daf9e0741f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the document is a link farm hosted on compromised or disposable domains, likely intended to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=screen+mirroring+app+for+android PDF link annotation
    • http://ascensionchina.com/userfiles/file/81786388018.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/burabibegoxipofemusewero.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1d5e511b96092bc16e03a1c0fd49b1ba/ligigokedakobolinekipu.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/42327529797.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mjr35145nu5pk6p4vv2jksl4v5/93636441321.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/saxatosabejagexuwuzap.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kezogizitumuzizaxaw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ad3807b86489434404ef80777516c73b/zabuza.pdfIn PDF document text
    • https://vientangluc.com/upload/files/19784629237.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/vubifaxiketakoz.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jireburofexufufitametab.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nexowupewabidemilurabeba.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/43242656135.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614056dba8c20---26511919909.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6054b5c1---tusuvitabadosulidixu.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/nifimilozimosedemutafe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/007203abfeed0317a168db35b0123549/28560517322.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/8253318203.pdfIn PDF document text
    • http://labsshop.com/d/files/97460552805.pdfIn PDF document text
    • https://tipresentoio.it/images/file/mogos.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/sagoniwameno.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/37743235775.pdfIn PDF document text
    • http://soles2walk.com/data/file/nadafi.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/19535625272.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 17640 bytes
SHA-256: ec12eb29b819d305e2b6244b82e14294bd7289336d94b35dbf47f1d16876295b
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10724 bytes
SHA-256: 94e343678d7f83ff9f7521c28e6891b406bab06669a8d8ac68391fdf13bb5b14
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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