Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0838896ea6cc5d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3e53067237dc7a561a5cdd5aa309cbf SHA-1: 822c28a3cd06f7ca24fca021ebfecafed7a25269 SHA-256: 2b0838896ea6cc5d7651e451208383175426739a48c8dead212802e7127d1ecf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers flagged this file as malicious, supporting its role as a potential phishing or trojan delivery mechanism. No scripts were extracted, but the structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://agenziaimmobiliarecannavo.eu/userfiles/files/bixunev.pdf In PDF document text
    • http://splhardware.com/UploadFile/file/2021092812571173499.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/novakiporaxozapuxixiw.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/rugorotafa.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///ropozedivilokijib.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dekatisaguf.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a00da110---55941155467.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/puzujuzibexutebimotiz.pdfIn PDF document text
    • https://cmf8.ir/data/file/zizok.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/zenowopexofalejatare.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tufonadiv.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/tetapuragan.pdfIn PDF document text
    • http://soles2walk.com/data/file/susobafekofa.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/fabusozu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/82ddf184e20520a780dec67447bed502/vemibemide.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/begolexudizol.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/patumugumufeta.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543b362936d---94873906540.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b64a8cf1f1f89e425eb46a5d41332fca/zepigimajiru.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89c06992c---rakanadivefusavajeb.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/37495575657.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615409117b83d---18614557152.pdfIn PDF document text
    • http://hodori247.com/uploads/files/mofutisevekajuv.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/mosaravexaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=reboot+redmi+9PDF 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_off0000b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 18004 bytes
SHA-256: 89c103fd76ca666dde3b86d1cf1577d03dd675ab2eae30634e8ce8a41d72d478
font_02_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10284 bytes
SHA-256: 4db418c2254577ca4b10ef17470510cb16d3ff7960d3685cedd75f7420f22691

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