Malicious PDF — malware analysis report

Static analysis result for SHA-256 5181b8461ef84368…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 16:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c478ddb62560533f05af714df0443ca SHA-1: 57dbd6d6931eb5b26833c78f22c594adae8d0ed3 SHA-256: 5181b8461ef84368d9a90fb6a3cc52b4e837c8325a8fbe8359d1163ebf83a3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution tactics.

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/47eaaf912ced6b421c8cb052793f1a27/38849311148.pdf In PDF document text
    • http://epmresearch.org/userfiles/files/93161343862.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/41250882189.pdfIn PDF document text
    • http://keacg.com/upload/files/kizuvu.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/78783228624.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/096bd1e2a78bdcd20ac56d76dae1aa8a/81242513292.pdfIn PDF document text
    • https://eternalbliss.net/file/fizewevezimugu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902030854475731.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82203453245.pdfIn PDF document text
    • http://teplospectr.ru/images/files/65336882979.pdfIn PDF document text
    • https://masihpt2.com/contents//files/8883525676.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/zavetinifemotos.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zogad.pdfIn PDF document text
    • https://alohasafaris.com/files/49139924197.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vopuxolax.pdfIn PDF document text
    • http://mutitar.com/user_img/files/jaxemasaxowigedanogojeke.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/kewalumujabekamedavu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b74a8d0d---49350372664.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa7e3313f---dikonu.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/95860396181.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3e51150ba722045878bad3e65819d735/jenujusigogigirunagome.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/nafunarovekonubafujinexe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jerasisajaropobobofaxatam.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/lesile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=12v+digital+programmable+timer+manualPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10948 bytes
SHA-256: d8d97986f4887be287f56a33ddddda180b5875c16e330e28a42dbd3fedc28914
font_02_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 18668 bytes
SHA-256: 3166b751669a0d230ee164ddc80bbb38ddb9542cd79c058e2b3c4908d9588680

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