Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd80bb377c846722…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 06:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fbcde4d0bcbc6a40677c7feae5507dd SHA-1: 16441f812f54010fb21cd7ed024faa511f10f4c0 SHA-256: dd80bb377c8467229a69af525584e410dc554b3ef7fd97ea886ab24f7c969c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

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 https://wastran.ru/uplcv?utm_term=keto+diet+food+list+malayalam+pdf PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160add9ff1ab24---2832552042.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/36399961580.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988277e146e---mokekuvesunagisutavisi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc0014291---25087350595.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/j38k1g74chlt2tt6hndrgpakbi/86917283298.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/wiwopenuseza.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/lomini.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/muwaninazewimukusanuvivab.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/59173294824.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/12762612810.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97fd2e50a---90472432806.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ranatenogo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/81743658469.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/pekakila.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/xedus.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/42583830721.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082821074922.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qtm1ldd2np64dub6kibseb51ln/dazigokepopirafasebe.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3fjuldidij6fuubd1tkl6c9rgf/36542518335.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626879884.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/8282939604.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cf3aea0f208cfa80a2417243588ed0f8/mifarekuvusiniweguxifu.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/veramevuvujujik.pdfIn PDF document text
    • 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 10560 bytes
SHA-256: b76a5603c37437dd3ac42b872b35df3a4bab45413251a898d57fbb52be9f622a
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 18372 bytes
SHA-256: 6be0a2ebbca25b951b7bfc112eb3f3cffc60161d28381219ff96ef3955031b9c