Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74333b4935e5fe9…

MALICIOUS

PDF

71.1 KB Created: 2021-10-06 14:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ce4bb5a07354cb1fe0590991e1857a3 SHA-1: 61b1c8cc3ee5b4c5711ac41f9c0bef9fe44130c8 SHA-256: a74333b4935e5fe90a28f47d6d975ab29184f163580f4fa5ad2d2ac2a1f5aab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=warner+company%27s+year+end+unadjusted+trial+balance+shows+accounts+receivable PDF link annotation
    • http://coomargroup.com/ckfinder/userfiles/files/26848193595.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/norixire.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/63933089727.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/5288017880.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/pozamitesavaje.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/bupakali.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/99327353181.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/zolegakevuvifuw.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/dipupusojodiribazu.pdfIn PDF document text
    • https://yuktogel.com/contents/files/88795634256.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/lojojavix.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/42995813617.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7d9abd3e324340cd9573c4eda4ea0d23/gafigonozipom.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/39393296088.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/lovubepojekevixesago.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35257b002c55674e609b8db513d964c9/42788593498.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/38735367394.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/difitarivubifuruzogix.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/funosiresopujemi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/99083974303.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/divefadadeluvimixafe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bffbbd3a45---38410974560.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092612554773.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/38049590462.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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 11444 bytes
SHA-256: a4ab53f6ebe96dece14a5b0d9d0a62a1be82c4200ff9d8d2afe5445dbb48150e
font_01_sfnt_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 15104 bytes
SHA-256: 19c92ca0a09998f9bb01e2f2b31302b87640358c35fbdb6c9bf02ae41cea9a85

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