Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd94ef0deca3bbb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 18:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a101b91c490b8966304b6170f221ae4 SHA-1: d14c655ff1001354754ec75ad9ead21b656c36a6 SHA-256: dbd94ef0deca3bbb08677153c7a8818d311b4bf38b97ab9c3a23d403fe5c73f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://rbc-bezorgdiensten.nl/upload/penepunu.pdf In PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwulodusi.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/mepimibogog.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/11129737472.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/86514109007.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/62643072677.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/xoxizemomenarako.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614058513b33c---73432034686.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/56833464365.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/37361602464.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pidiwegukukem.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6871766dc212fde808a6e6ae20746f4c/jenezivugaxovawuf.pdfIn PDF document text
    • http://metallpress.ru/files/58919336755.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jetekikubulugotagupuli.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/41151515621.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/59067093527.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/xisenomodupafoz.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/1556515464.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/74596797777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946ab63361---fimodiniliwupok.pdfIn PDF document text
    • http://mfahk.com/upload/files/ripokivuvulogufabum.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/50259490241.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/45864963251.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/afed3395f2bc937e421d190014d11403/58463570267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=family+guy+jesus+gifPDF 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_off0000b62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 15732 bytes
SHA-256: 77adf9845748bcb948808a820126777a27c73da620d3c9c688e95ca5af023bf8
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10456 bytes
SHA-256: 6f704a2c927a1737f83d91348c731aa581b230baabefb652e3576860dbc3e546