Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e15934b36df8628…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 05:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41e8d3b4c3355c0c670ee64915eb2b78 SHA-1: 1be79618428b91ca07c2a7a55d8f12a09528ad8b SHA-256: 1e15934b36df8628ff5c26a304de46ea4ebbca2ccb3e3c76d922ad477b518632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, which likely serve as part of a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/863674744b25deabebc054af37b10613/kozipidolasek.pdf In PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/64949052612.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b1fab82efb324dd3675b2915d4d83718/78718219980.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e0f683f79e7a57993c5d26a180679362/59026095960.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/wubavurebezewuraratiji.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/75643583168.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/770963c5a9f2174de1a8f3bd59f462f7/xomazi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d29a691f9f505cbd8077dcf74fa6099d/44190878110.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/domututoromosexi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/52329380691.pdfIn PDF document text
    • http://soc-in.com/data/media/files/98770026701.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/39409459859.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20dc68d2c4a3edddcf54abc064e4adb7/95044996987.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614111f9d1310---zulavireworogalosuwomef.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dbt5d85mk5lkoip6toev6njovv/nekuxegubufotosobenuma.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/gujokuvedumivokudomuz.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/87154052981.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/22709064984.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/lepuwidubupisu.pdfIn PDF document text
    • http://dezis.ru/uploads/files/panan.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/83668007542.pdfIn PDF document text
    • http://shesob.com/file/files/79157451283.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/85612274115.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/samufesotenubipawa.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/70446960512.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/dasaxigularexikubadapozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=naruto+shippuden+painPDF 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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 23400 bytes
SHA-256: 6ec5341bff806cddfca9bd02de0c59817a577d2e6ff17d5f7fdc1ffa9b293027
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10520 bytes
SHA-256: 784f34800c412ab683a693e58fd901bd416b657f3aa2c0222eb3ad3eacda2e69

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