Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21b8cce4bd5ad5c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 14:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee46abf096be0b34c7e8828c71a9fde3 SHA-1: fedea4b6bfe7046c44a3c2d40ffdd5683592646d SHA-256: b21b8cce4bd5ad5cf6720cdd01ad36fe1607bc0e25acc81125f8b6b323d669c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or scamming intent, aiming to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=app+namorada+virtual+para+android PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6720209bc3b587ace664f51861edea33/78288476445.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-13/20210913024328836653.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pumexobukomeduteledogun.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/52623700885.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wofebixulivagupulajunow.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zutivimubexotifodomejajop.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/10151157620.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210904061339.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cdl2jqblgjb0m6t3i6tdippjvd/90244469031.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mezeresi.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/98138853250.pdfIn PDF document text
    • https://baglab.pl/galeria/file/65436175010.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/40274695892.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dobujomexabifimob.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162f45b88f---fufisedadedigu.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/ditevusojawuvam.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/kimizuwefevedeniv.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144205e4ce7f---89152230465.pdfIn PDF document text
    • http://schokofontaenen.de/idata/7175367561.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a3c69a67---vaxenovapivibamibejiful.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aa9d809db5536d419b267cf6631178d6/farire.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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 10400 bytes
SHA-256: 3d782800cf4329755c406bb080f07c3ce98d512211fb3c41fc724f94d9adf5d8
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 17424 bytes
SHA-256: a251a4fc56ee11b30264d368a7db3682be0dd76178f357a6451db70d3149f586