Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1701976b8b863c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 23:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf3bc84615c75c24ca6fbdd1e70c41b6 SHA-1: ca7a2de5fae79bfbffa68f231ac2562515b668ce SHA-256: ab1701976b8b863cb470d207c0c7c579eaa0f354b7687a622fb0866a8aa14800
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This pattern is consistent with phishing or malware distribution campaigns, where users are lured to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=do+mobile+android PDF link annotation
    • http://immopolignano.lu/images/zanalisilufigixe.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/zetoduragivufu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/tubatebivomakubu.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96813461568.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/22611720423.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/2567848736.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161381b95f2d3d---25443945073.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/8586659782.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/73615895186.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935780ba56---tukobupifamizukelagumevuj.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/wevutugopemodu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/78799558136.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/55992242916.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/62378215170.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94853921833.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tezosilimuxinub.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/22885364576.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/61584640265.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4aa26951---kidawoxojebu.pdfIn PDF document text
    • http://floramarble.com/uploads/1224055043.pdfIn PDF document text
    • http://hainfelderteich.at/niluxumesetafuso.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/96416637929.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fuwevufakawelu.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/32133833247.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 17744 bytes
SHA-256: 7e5a84722bfdf78588ae646079bdae2cff3f3d175c0d40d9026a8dc0a8488ab5
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 10284 bytes
SHA-256: ce5b8d153de9e97f2d84d3b8e69d98f8e3a5c1943ed09e5ae78d77a1fc9adeac