Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759db1553380657…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 19:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4690c9e9e240ce956ca9cbff798d007f SHA-1: a2beaee267b61b2ad580cf13df2efc31a1d1250c SHA-256: 1759db1553380657f30ef2c7db4693a5cbb9c4c5caeddb66c6bdf4bd1db4daf3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://aashianarealty.com/file/84184064495.pdf In PDF document text
    • https://vieclamday.com/userfiles/file/luramelaw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac99ee54aa---9402438329.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff23c3a6---86561878246.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/1200056371.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/314ddfb25b609f2c68d4c033a9bfaa44/todusodigojig.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/sulapit.pdfIn PDF document text
    • https://morabia.fi/images/file/51332103635.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/68366503182.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/31098738637.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/surazawenula.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c690f9b5472---taresezitoratave.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/tobuximurinirowufopag.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d1f64418bd4bf4520a1533b996100870/xukeriruxatodexik.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/97188580211.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c3145a5154d---fitukifoxonogefekajotibij.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/femubemaxumufimexalafe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d7fb4f14bca175f6d86d3c08cca33e94/98402431083.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a44b69838---57448612366.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b57f4d7455f0aebac67a25b8536d0796/senunererisetedimeriz.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/87264003866.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/edbc4c800805f91cba2b12046f8d37e8/94362603983.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/38408314352.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e7cef6be---82793336645.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de982cbfe7c---pomizakasazosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=difference+between+conduction+convection+and+radiation+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16716 bytes
SHA-256: 8be5ace2de7b9d05fe8a746c98c7c76f6179e9279dbd89baad770ebb278a0e82
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10792 bytes
SHA-256: 9b02a2b4f8084eab5b352c13ff9dfa575e9ea71348723bc9bd82d49802125a85
font_03_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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