Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f893fec8f44f74…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 20:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f2971cf16a08cd6ce70f9c24aa60ca6 SHA-1: 8e8b7eab3ec2785b6ff85ed973ef05e376173218 SHA-256: d5f893fec8f44f74c1890700691a265cdb7067fe65ebbed5406a2b8644f69990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Analysis revealed the document functions as a link farm, with numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious distribution. The presence of multiple 'link farm' heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://skupka23.ru/upload/m/karikaz.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061822ba376---54451684127.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nogibesobabikafaxuzok.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8570e2ed813fc364615cba10589ba5f3/18764802550.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/puvulesofofomones.pdfIn PDF document text
    • http://sooclose.eu/upload/File/76885285067.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/vojekedubil.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/90491877474.pdfIn PDF document text
    • https://anup.bo/images/files/28781563722.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc934df04---zosokodumanaj.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/74358746708.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6552fa55e08a799880f14d768b8ddfa2/43834401293.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/rosojitarij.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d8ae3bc4---25490023159.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/52088473400.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed776509ff---19831916052.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/49767862467.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80318475961.pdfIn PDF document text
    • http://feminella.ro/upload/fck/papapemexaw.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e5cja73jtsdocba3kb61es3ce7/58011018693.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/51119547231.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fixusawipezojevepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=atm%C3%B3sfera+modificada+pdfPDF 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10752 bytes
SHA-256: a8cc15f9ce742c9df29db3e7598705328a0ee4a8d69b38b4e0bca2c1894d1454
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 18668 bytes
SHA-256: 485d4f904a9dabc84e90258b62c9df2f6c380516787b87d3a1a9c35342e2b1af
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.