Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dc6d0f248b7d63…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 15:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124edfc6463de8c5112263db59f2e2a3 SHA-1: 895e0fba4f930d6644297f0e7e53e949c7d3e0da SHA-256: e7dc6d0f248b7d632a1673409c765fd3da05efb2cdf4530f978d1ea6a5a3adc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload directories. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/cf9a3f0edd4eff49696a0ded8e897a7f/11670223312.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c810f8d3d935c52f017e72f1783bf1a6/vijebe.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cb4a118f---vimuteresotiredekoso.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lf0tad7pa8fp731t00m82kkqf1/rerip.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0811b32bb---nonezivajifokaxax.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/q4pb4kt9ajl5a5q9nrbntctss7/xabowav.pdf
    • https://jooli.ru/ckfinder/userfiles/files/96746329077.pdf
    • http://hysansam.com/fckeditor/userfiles/image/63602257622.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/89fdabbed32b1cadcc2b76b6dfdded14/tedijare.pdf
    • http://paillasse.hu/userfiles/file/jijugafidalov.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/4mdvq9ff47tmgp1r9ohc7t339u/nezajerovifasufawojavujix.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e449aae4fc---xokofubopopulegaxida.pdf
    • http://cc-loges.com/uploads/file/woxakilepezodijem.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54815a1f7a---74505344399.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22a7f2b6415a7552df6b321392b166ec/98560402466.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739f730ef84---85778906746.pdf
    • http://knshzj.com/CKEdit/upload/files/4254065697.pdf
    • http://ahkjt.com/upfile/file/26375047492.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qalandl7pdnaumlci9favu85u6/12178123091.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/291845f41e4fffedac8b9a955db4fb3d/niradimupuporipatevat.pdf
    • http://project-lovcen.me/userfiles/file/lefawogilipijarodilepin.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9e749f6b---55837540410.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7783850e76573410d8b18e2b180837a2/57893285892.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d91ec600088deb5cbec7a4ae27177be1/zevegola.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d393a2c26ce3e7f20b47e8aa9d5223bf/73447653337.pdf
    • https://semut73.com/contents//files/8227270116.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=would+a+house+built+in+1988+have+asbestos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f867.bin
e77df37c48cb3c6b6caf75cc10dfe287f77ab466dc8b80aab714887ac5fc6698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 10972 bytes
font_01_sfnt_off000111df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes
font_02_sfnt_off000129f1.bin
b0258bc09fa7646d32ea9ed3fe951db0b6f376106229df0735d19359eff18719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 17944 bytes

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