Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8067d1b1a5e4e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 17:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79b9beea5295ffa51fca91493f34ea05 SHA-1: e7e3e396c8b312aaacf662d6a7a5c7fe9b64f2e9 SHA-256: add8067d1b1a5e4e2c26bc68ed257a72a2377159d81b0a97525b15515ecf4c86
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of these links suggests the document is designed to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3556310945.pdf In PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/35994689285.pdfIn PDF document text
    • http://belovosushi.ru/files/gofovotovow.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/75541341424.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/serero.pdfIn PDF document text
    • http://apex-architect.ru/images/file/31629393595.pdfIn PDF document text
    • https://kuepancong.com/contents/files/63962896021.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/49231420305.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/33995720528.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/56794998027.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/62208865996.pdfIn PDF document text
    • https://samudra99.com/contents/files/radokiratigi.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/55266667843.pdfIn PDF document text
    • https://flomogroup.com/upload/files/sotozinekajuse.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7c74d4c78976f6783fc1ded6308748e3/xukugafidex.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h5sofp4gi0atud4bkc2q698l8g/fuxasoboriwazuj.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/21767691945.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210901_10929AD33BF16CBD.pdfIn PDF document text
    • https://brakos.it/file/podubasatewenokinigameju.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/68937432048.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0378b871---10571632464.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kipemakuvopunorofuba.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/jifobuzemibipumuvedikil.pdfIn PDF document text
    • https://bachson.net/upload/file/sajowupujebovaditovajaj.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a42638e32dfd5361dce04c791c68e7a2/37074184370.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/83649950131.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/rojejid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=resident+evil+1+apk+download+for+androidPDF 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_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 17468 bytes
SHA-256: 05aa64c4a157f12bc8d855cf2eef859507b6e0017a86204a3a35191478c78440
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10832 bytes
SHA-256: 8fcd87481cb57b5d658944a8bf5ebb5b4fdecc62b781301940b7d80d7de5f48a
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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