Malicious PDF — malware analysis report

Static analysis result for SHA-256 3907468c331e6a7e…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 01:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7d560cab116d2ce2b2ae58a06756b21 SHA-1: 5a07ee3a6b7247621bf87305689df96abba72f06 SHA-256: 3907468c331e6a7edfedf781c374c6ec21a713dd1a9f7f618148a6168a7a77e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://orem.mn/uploads/files/88565950469.pdf In PDF document text
    • http://ahdjcm.com/upload/files/48152526960.pdfIn PDF document text
    • https://rm-parketi.si/uploads/90495019678.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/rovoro.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fonibotota.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/24820818693.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/99987860720.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/648eacb12ebabdb79fd682f1e14bc822/giloxij.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rscl8jeerjcclbnd6n823b59kn/21997993323.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c5166322---8021616476.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/17805j4ofqkf0ahr9o382urod4/62365033940.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/76468430030.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048f49ba31e---totopurelomadi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/xibezipidapokiwidemufi.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/jaradevukidumus.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/87703197630.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/56320266608.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d517b04482---sezotopexozaw.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tf32k6vqo5e8rstk4g3f8o9ip6/34860413826.pdfIn PDF document text
    • http://yjccnc.com/upload/files/2489192769.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/61764528614.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/1037912025.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/viwukisagudiva.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210726_493FA87C96E0893F.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l6ei6cf06kk8901clnaptsl3ui/xeruzobofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=excel+ods+para+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_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10404 bytes
SHA-256: d1432b63d55cb0bb6354e4f792929674988b2a1d582275dac0957b3a0efaf466
font_01_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 20612 bytes
SHA-256: 4631299dcce1a6798d5b81c711c423be5a8d6916e055016f3d171ae337d240d5
font_02_sfnt_off00016488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1