Malicious PDF — malware analysis report

Static analysis result for SHA-256 742249acf42af937…

MALICIOUS

PDF

75.0 KB Created: 2021-08-27 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 525c2a44efa21f8d1cc7e7bdf0cf6c1c SHA-1: 46e9f2d9fad8675517136a6b5b0f535197108cbf SHA-256: 742249acf42af93743d9fc55b5c3d1cef12ad01ce35683fd68b4542ae0c80823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/01aab045b760879dd925694acbdd7073/34409865544.pdf, are likely intended to host further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://rentaruedas.com/files/others/lerezu.pdf In PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb47324b72---84917747230.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9hia17h9g2n804lplosggtb091/59978644574.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/37875893610.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/fiwezexufameganem.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8697565765.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vowetaxepujifor.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/garugurubipapa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/banozuveneje.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/6826424103.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160f60551496b1---39450472445.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/winabi.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/busibasog.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/64840177524.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160acc73a7d29d---53525925891.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/wimojapepifumor.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df6b8c0e7c---vijijinadikifowuvis.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80729c210d3bd95be7a112b630936ce5/73233270865.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/99163084563.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/22280458111.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nogowamagexivawo.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/54643407549.pdfIn PDF document text
    • http://abnicum.com/files/file/44083334633.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/lozidode.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610087af9b497---gevokobifidaw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/01aab045b760879dd925694acbdd7073/34409865544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+pencil+artPDF 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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 10416 bytes
SHA-256: e84b26f0d8a1ff2c2f37ee97d80b50c41a595b5a52ba5396a0145e98c8997f2f
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16156 bytes
SHA-256: 2d58610012c6736ad2856ad147c96f3f110ffb47108efd9d320adb62645df048
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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