Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac523b99618f4730…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711d8720efdbd41199a37e71920f3203 SHA-1: b5a68657bace51b05102b638b1a946d5f37445d3 SHA-256: ac523b99618f4730a6e40ab457bad3ac5fe15cb7d6f090bdc490cc315cdb6228
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b638145d9d---24215407919.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/gonenasafoxowulu.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8siu8c00kqujujkdghfo0kcm62/27106409346.pdf
    • https://wrd13.com/force/file/dudatamudinumudugafifaf.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02f7c26d5---95174988359.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8c9c175e1f13c5053a43efbac61e1122/potesifume.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9f6d5506---pozaniratuveginevope.pdf
    • http://mnogonomerov.ru/uploads/file/3947548102.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd57e0285d---siwifazivavazelutopusa.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607529685cbce---dojimigubutadilaniwa.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5be9f214285214229758dc75d738fd7d/22668262640.pdf
    • http://www.emailposte.com/pictures/kirogoxonag.pdf
    • http://antonio-pelella.eu/userfiles/files/80160210783.pdf
    • https://wecareu.net/ckfinder/userfiles/files/wabuvasepidipaxo.pdf
    • http://domusanna.it/userfiles/files/turiruxesoguxikexi.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/j6qhrdk6fdqopag7ua1kf2ffgj/rudadezemufewigo.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/56815371839.pdf
    • http://www.srijonihealinghome.com/fckimages/file/xibilibiwijuwitubo.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076905b0a7e8---33930765446.pdf
    • http://cdmatik.com/uploads/file/xuravifobel.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/80296973778.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/hkg626omqfg578ic46sh1aml93/xawalexekowuvubigapawa.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5bbd1afd93d3537d6deb69cdad7aafbf/pegikisipixodugufosibevud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=barrons+gre+latest+edition+2016+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_off0000d52d.bin
7f29baeac8870b5fe006a1a823e8d0b748df345a42b7ec193c1781db179c6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 17524 bytes
font_01_sfnt_off0001022e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16792 bytes
font_02_sfnt_off00011a45.bin
233a89ce268faf52f30b8246f65b5bacac47d00f76ea5844eb708ae7a7ba255d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 11188 bytes