Malicious PDF — malware analysis report

Static analysis result for SHA-256 65785bbf03cef885…

MALICIOUS

PDF

107.9 KB Created: 2021-06-29 05:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68a81607dc6073e48dad215e287faa20 SHA-1: 5496c46450901b0992148705fdad963dd95b96d8 SHA-256: 65785bbf03cef885d9fe07033b652278625edb45070d90bbdab6bc60e5823593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://crewmak.ru/uplcv?utm_term=hannah+arendt+thinking+and+moral+considerations
    • http://alexhoffordphotography.com/temp/files/file/fafezevisazif.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608739820e7bd---31183982101.pdf
    • http://abbwingslynnhaven.com/uploads/files/berodipavipetivevuw.pdf
    • https://dm288.rs/slicice/file/38587351823.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/brv901slearev6lle4iadd0dt5/bajidosulo.pdf
    • http://immobilieninvestors.de/userfiles/file/19536565213.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/lbh8pe704cf6ha4cul3qko1nck/jajuvixovibuwere.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0028a4dbe---nigopirevik.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d931ad674f---pavana.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/61696557445.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/967856790.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160920ab1d0748---16755783522.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15e4d0688a0434323cbbb1f256e3c06c/49980944843.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ff4ab045---55882271509.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6ed7562cdfbd9483f462e1d77ded32ea/29143266472.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721e2ad978---fuxomed.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b4a8001dfcbf3debee59bfed4f305018/87238165351.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8d6ca660a565d2b2ec0fc0205d084557/sorozojerofo.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e698930ae217b0fa0a186eeea8d23c72/31604983998.pdf
    • http://ketoanaca.com/uploads/image/files/gojak.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/9172166327.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aba8060fd---fexezitonufoteligut.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mcc5gbooji7v89su9q4ivap6kq/noxolepumolupifosijosiv.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd635f12cf---21367574488.pdf
    • http://paillasse.hu/userfiles/file/8222273384.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bd0t10o4ktt816udotsllid2lp/remegufivid.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_off00013fa5.bin
e91a585b604ee97ecbae6850c96c5b4384bb6b25d1ae6700a6c83d9404fe6bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 19568 bytes
font_01_sfnt_off00017107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17107 16792 bytes
font_02_sfnt_off0001891e.bin
231e1e6ceb469fb172c2746ef9725a8e5f25717b61018cc3e930c734d9514553
pdf-font-stream PDF embedded font (sfnt) at offset 0x1891E 10900 bytes