Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6adcc7cfb93272…

MALICIOUS

PDF

88.9 KB Created: 2021-08-03 15:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 87dfffbe89f1a256643910b4fb2ba130 SHA-1: df0ad6b8ebaba7bcf05339aca3a1bd1a2b50c6d4 SHA-256: 1d6adcc7cfb93272e5dc8a92ee1facd25ef310827b0ce2b3c4c0463d77a6a337
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in one URL indicate an attempt to obscure the final destination and track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=windows+10+pro+hp+oem+iso+pre-activated+%28x64%29 PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/981f4ff148fab35359a62e6d3f6ce9b1/zasadabogogukozite.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106bc186bb11---xumegapilumuk.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56478758c---fivuwokowokivukal.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff333288eb---38452601595.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/050ca37cab71e35328055e5ea7369888/75782023380.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/84f4f00f165a8f461fb36ead310594bc/60792834952.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wemomarodixigenepe.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/61045052643.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/jogelavanexudatude.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nutoxasudopoveleped.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaec1f7c7---8472137661.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/7901188176.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9366b5a8cc---65089559793.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/wepemesopulej.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/juzirevuwe.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/httvjjhqvl14dlaerkcsaseel5/midunofe.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/73053811254.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/zamemorunus.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b31660b90cb---39436100753.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8669609f6bfa8a77adabca7628b42e1/lamakojat.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eab720642f765f54aece1a4b860d5c4c/vafuru.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664777bf97---ropujezasuvupajete.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nubutirifefig.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/53934333719.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076334bb0a89---mepiruradikugumolijo.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16928 bytes
SHA-256: fce3f3ac717c5d38942d2d9864c2fbaa455e0c06095a7fd0f4fc7a0644598d50
font_01_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 11592 bytes
SHA-256: d45a18b1d1e9b648fc3f7bfcebbc9531568ec60aa46ed97345bbbbdaef48270a