Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8629e855561d8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 08:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d701f4b388ed57abecfd73a2ce05691e SHA-1: 2b81f0ec2467e6d013897040e70bd6eb3638c445 SHA-256: e8f8629e855561d88ec64daa78c3d1e10be3ecd16c7b66bab228b91c1c3014e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs suggests an attempt to redirect users to malicious content.

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://smidgel.ru/uplcv?utm_term=fs+16+apk+mod+download PDF link annotation
    • http://poltinka.ru/userfiles/file/maziwosudafonibizafilufi.pdfIn PDF document text
    • http://elitacasa.it/images/file/11216244363.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/73861715995.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14b34e06d---sigozoxitibajewusob.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/86547140889.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nisobodajujexaxusa.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614376c2052e3---vafanejewupikovini.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bozezawetefode.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/72186418786.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d6124bdbfd794330426395abe4cfcc9b/zufipoporupuzobi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rofadaxisojonojimoxal.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/buruxexamonarupesiwafesot.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/naferidakotalusafeze.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tafibirime.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fiwukimumojopivezos.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jisawatiruleruzakamitin.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/49947327063.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139237ef2d4e---1203908895.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/rezivozukupudewatap.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/75834407651.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wubumadizesoperi.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-15/images/files/81027804835.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/xapasiruzetizepuremezog.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/46789171571.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/904884133.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_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 10504 bytes
SHA-256: ace8376bf34d7b1525657041f7491c20e7f188b40c57186968bc10a4ab69d1c1
font_01_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 16484 bytes
SHA-256: deb15f9fd375308082822fe01c4a4f5964b5c768bb489c7a289938a99b116a25
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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