Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb171cea06a95b7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 20:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdae25c082141610d1be869a2c7fdbbd SHA-1: 61213bdc255cdc3d7b862c14b9b5afa60edc09d5 SHA-256: ecb171cea06a95b7fb4ac2e0ed080e57710ec9cc8f2354c063dd2e19675e9e0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure to download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://caratow.eu/userfiles/file/bexubawuvakodofadejiwof.pdf In PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/dulabumedisorinesi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/203490df91c3c1aeb7f770cfa9dff47e/sogofuza.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/89408354251.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12kk619vbg7j16gjmrbf78ml34/17162971530.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb5b14921---nalekarutesebe.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4391f2695---9797108564.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21350004664.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/75837181943.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jaxemanogano.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/31737362388.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/53242961772.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/jekopegexuxiwatogufuxudi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b26905249---begobepivasepuragazexesol.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5620752b---33304474179.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/62638076469.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/22923654717.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zefarewamekifafonenina.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/veperu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12818317828.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16093d52620e21---92646596525.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0356bd9237---bowefovutimixuwejeref.pdfIn PDF document text
    • http://amandamaitland.com/images/file/77910671417.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8d42a9953c558d6926520d3b4fc22cbc/64307980295.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c6f489ecf18f5341dd8ccf2e65e08ec2/denusabud.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/magiked.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9042564d95eca10b97b53354a90baaa/kozatolikuzitixojuruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+of+afrotropical+diptera+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_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 17540 bytes
SHA-256: a6fa833653f3b28c6fc37774e0d29021eda5c240c697c5d48efa32d3cde63ecb
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10540 bytes
SHA-256: 68469cdc113cf06c614423862c17aaef87aabba65249f3ba0ee5ac258eb96ff0

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