Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50fec0a3ee8d55a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 23:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd3fae4b6ee41c4a3f9ddb2b6ff88826 SHA-1: 9218a5502e4af108f421087ea1cea311dc6b71db SHA-256: e50fec0a3ee8d55a92e8687a7792b82f5b306c04c5bd2674fc8ab38b0b7e7407
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. Several heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=contacts+not+showing+in+android+phone PDF link annotation
    • http://avtokit116.ru/!upload/files/sudejewoxixitefonitid.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/98981808284.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/jilakubirepigajudomoti.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/janiwan.pdfPDF link annotation
    • https://arbormaster.net/uploads/files/89403876396.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c36e968dcf2b8230ddae274615afc7b4/37548977669.pdfIn PDF document text
    • http://www.centralperdana.com/file/12502158929.pdfIn PDF document text
    • http://chpcentre.com/files/file/18680946025.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a620c5b5---64506898661.pdfIn PDF document text
    • https://maturana.cl/upload/file/98301639454.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905012329.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/8119969087.pdfIn PDF document text
    • https://isleo.com/i_photos/file/69649628895.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gezokuzexaluvuletijid.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ea79d18---vogijadaxofitagapa.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sefali.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/48180394112.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/faxabiziduxorofajemido.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/48331902714.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/sebatetamiliw.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/78770389732.pdfIn PDF document text
    • http://apple888.vn/luutru/files/pimuxudokibaxadijer.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vuluvudiki.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 17256 bytes
SHA-256: 5d3417f7c43fdd5419e28c5246909c692942ff5bbaf7727080617508d108814e
font_01_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 10864 bytes
SHA-256: cfbfc9955c55fc98c286f27fb98e536ee8c6f45b9ff915d6cb22c57f9f634965
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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