Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62d882d3b563499…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 02:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0db2d08162b43a8abd7b922896b5db64 SHA-1: 7c921c8a1a67b10b506a1b69ff88e20043bcd218 SHA-256: d62d882d3b5634990787331addb264cbf7c289970f9f891468850b55d4e678bf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URI heuristics and link farm detections reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://kaptenhoki.info/contents/files/megogoko.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/tegusog.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/73433578061.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161388c2a044fa---46931519627.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/gusis.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/89882762565.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/55610703006.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134675c3ee27---rozezuxupabag.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161307e09b7965---58126551571.pdfIn PDF document text
    • http://kechengchem.com/upload/files/39437477711.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/livixa.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/nafudalisemokoduzakosik.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd421131c5---84467075995.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/12768982414.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fc7a7d154dc47c2412eca72e41d0fa2e/junozi.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sipapikibijopabilabi.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/82670598250.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/baxajedemos.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d668077d3---navex.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ad5b30ec2b1d947b94cccaad0c22976d/92902393158.pdfIn PDF document text
    • http://quranday.org/userfiles/file/66086870059.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/20117562233.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/memamegikuzixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=magickal+cashbook+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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17268 bytes
SHA-256: 4f51db0b40962b81cad74ab8c6a9f6e11788ae58e81a1a712ac3fab46f29fc63
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 10692 bytes
SHA-256: cb759ddc65f584b080ddf40cc8b2c213325fcadb4e8540752394a705bf1f3617
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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