Malicious PDF — malware analysis report

Static analysis result for SHA-256 10abe8bbb75e7400…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 10:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb3829ffb9f0920049753437a00fca5e SHA-1: ce18ff51e53264981c18b860f402c6f15232e69a SHA-256: 10abe8bbb75e7400d479f7b50ddffd333d9bd3f1f5282771dc4e51d6203a6325
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b674df226cf---dezak.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/xadogaxekekusuvorazu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/13fe88f0f75937fd76e88dbbb0973d20/59117710307.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/78543104363.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/81980788570.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/36408889539.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gizedixekoligutosapa.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/97606581962.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8eb76620b66df9b0ad1232dde58ab5e2/75064426979.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/votizoto.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7bf61afc---divefevuzizetafoxi.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/57451582868.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/160869069760aff54a81680.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sq8a7h3gssupvel2b5k4q5dj24/fowoxerowifiroluf.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/detekur.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/nibomimubuzojetuk.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f53deb79---bopujovovuxob.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hpjggqhlgm2ss66hokem9vqns1/8099899790.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ujd8b3f8e4essaoketa0p9rs8f/jasetofew.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/ridewoposenilopas.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b540d946cd---lapuvekaselepifavul.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/967cb6a0d232ffb26d82c58a863aa5d0.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62d4da4f0---33351318182.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/fukukekotuvef.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pefufijebomos.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/81097579527.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8119167123---49450453978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nasm+essentials+of+corrective+exercise+training+first+edition+revised+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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16344 bytes
SHA-256: e246984ad5c158f46ad2884b64d0e6624bacef7713ba359f08a13fd54ffb3325
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16620 bytes
SHA-256: f5d0b542564f179c7c058f53df729e6b7d2d9991057c15687e648f7562ef51eb
font_02_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 11108 bytes
SHA-256: 9933e1562382bb405fb2ee1d04ffda2b4117eec134f7a787b7f70fd02d782c48
font_03_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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