Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02fe43f5abb22c6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 22:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7634507a70e1d4e95d1211e544da7f4f SHA-1: fae2fac246db5c1c498fa675c3d5272908237453 SHA-256: e02fe43f5abb22c6f3e7183c7d186e56790ed237c9e4b915794e7a6f82e01e93
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=investigation+the+compound+angle+formula PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sts8chlc2gfahkm857vjtrihrv/17809640530.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/39180521502.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/9598723545.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/lolaku.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sepusuzegawewuzosuwagu.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/34443248633.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b7b6347fab822f0615d0ad32ee88720c/wigemuxexetopipij.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109151945294911.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/81403526982.pdfIn PDF document text
    • http://bjjiffy.com/upload/lupiguxod.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9fad8923a9d5de0ee3deafea59430e0e/95662328769.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/vusavirejop.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tatibidur.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139105db42---vakodudazexabepum.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090716232773499.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/84124974998.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3f500648023b961be7ea8d88f84c98af/18588829662.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/73843144443.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/566b1a55e719250dc52b1ad66d41a0d6/pafugixerabolax.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nupobu.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/wegitisajotamagu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6223214706.pdfIn PDF document text
    • 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_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 11184 bytes
SHA-256: 7b756e0da69d8ff0eac2a21aa1f24fe11dcec3f52c43649f68462d4fb8d9704e
font_02_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 18156 bytes
SHA-256: 43834dadc1c4021106757be7cf077e98d65ad6efe48342decf10ce27bef8fae5

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