Malicious PDF — malware analysis report

Static analysis result for SHA-256 935d0611c2ea84e0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 20:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae428bd436420abc45df62d15efec045 SHA-1: 4f86cebc0275465f0507db97851d2ae17a9c6042 SHA-256: 935d0611c2ea84e0bc254b712bf72636d90c779cd6f444daab451566c62e7ba3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

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://dongphuchuytai.com/upload/files/wapijiz.pdf In PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/texik.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/sujurujorakusuni.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/9712263323.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/13842817524.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/010bafbe3fb67b527b2d69c7ca9d98a7/33544493515.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/48792296228.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/40298807844.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee12c92049---kufojasif.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/faxemugutukewide.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gl2p9rnlnga76tln6tids3emv0/liwebuzejop.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/63007609913.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/pesagomoruvulosuwunup.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/doxojopidoxajal.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/gajap.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lupinevojudonor.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/23990703139.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/59239528468.pdfIn PDF document text
    • https://il-gusto.com/images/file/mowonozigovija.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/98249058981.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/8777654714.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/nokexamavitogulo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613177bc26566---xanamesu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/jupogamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=convert+windows+apps+to+androidPDF 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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10520 bytes
SHA-256: 43b1aad933d29ee054a9111dfc054bcce8a955ce736a90fb8a81ef59d5743824
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 17268 bytes
SHA-256: 739bb5269273b1d2c9ec2a1e624ed2088106adb67c4dac5f2044a81cd145685b

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