Malicious PDF — malware analysis report

Static analysis result for SHA-256 54491c42c3249af1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 08:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78a22dd36ed583fc61cab7724a0f018b SHA-1: d748943e71b2f30c0682b022c2f600dcce0a135d SHA-256: 54491c42c3249af134a5b36d424e78aa896072f2ae2d0c7266921b8b770b1317
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0614e5816---86685703204.pdf In PDF document text
    • http://neonatal-surgery.ru/userfiles/files/96976752754.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/boxuxomurexiseti.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/foxuzimitaxefu.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/86231088658.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/47544882987.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/tiwepitowefo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zunab.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/vojakosekenufixonu.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rituxapeboxavelokojilifiv.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613af83ce5bcd---91952484554.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kiniv.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c871d3bbfa---pavutivukodaje.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/naseviwigi.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903193236.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59961983561.pdfIn PDF document text
    • http://gespk.com/userfiles/file/74544422445.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sonegemudenojaduginot.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/1674693302.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/15881114676.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909163244506.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///somaxunogirijunoxajosifen.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57f2af4ce---majejuxi.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/55192182341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apk+cycle+snack+app+downloadPDF 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_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 16540 bytes
SHA-256: 346ffe467bc984ee990ea5336181c39ccb54da91ad971ef1e45e63d602765467
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10488 bytes
SHA-256: 5804f0fbf34a402f1a0bdecc74b808e9b2bb44f92be7adffdc97b31c444dd247

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