Malicious PDF — malware analysis report

Static analysis result for SHA-256 c959fccfb544f183…

MALICIOUS

PDF

75.3 KB Created: 2021-10-07 19:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fcedaf25ded62cc7d8ff037bbdeb743c SHA-1: 3f5feb85523b6bec276dd0f8cba9d3122e2da7dd SHA-256: c959fccfb544f18382b3d4daeac3a06bc01260b29f3e7f3600d0da421a52dcd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting pages. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a3c74267640edb09bd8f310c3de68f14/kukepaparukikusufu.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/27cc900792dcbe2e075d2fcbbab649f6/4645525427.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/pamuxidimofonin.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/lebegi.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/73670009194.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914140157858375.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/popixeg.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/51523749185.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fipatefuserowud.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/58259566042.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/jerepibuxumakubizes.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/10866526869.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/bexesivotagabevagari.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakidodojoxebideb.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jajowufamizetifafa.pdfIn PDF document text
    • https://stvorki.ru/files/file/nodezozitesovi.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/nomuwozabawafa.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zazupeligu.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/newax.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5526da714483772c838828b5dfdc15b1/zituba.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/fubidikatebesipuxevok.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/visiniv.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zabexebopunejabivu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/18214583978.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cf0ccf6fee570433c3094c42f888e31e/visokefixozoponeja.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/11972069121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=news+feed+meaning+in+bengaliPDF link annotation
    • 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_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 10580 bytes
SHA-256: 78a6d395dd17dd8beabe101c300dc51bee6af8d875dedbab10548a844eeb0eb0
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 18500 bytes
SHA-256: 09fb773e7bfe2906f11c465f1cc77ae6f74b9d48afd67085fce3239356b8800f