Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c2140c357cef04…

MALICIOUS

PDF

105.8 KB Created: 2021-08-21 04:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7693340f67337f0174d0d60e6fab1712 SHA-1: c0dc0a3391c1c9561cc39079a54497e91a21239b SHA-256: 87c2140c357cef0405bddeb91fa224eec894e680a2fe260e4365fe134aae1dc2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised CMS upload directories. The presence of these links suggests the document is designed to lure users to malicious websites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://abeess.com/userfiles/file/57629098981.pdf
    • http://climtech.com/files/files/gumeginalobodijaro.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/81835658763.pdf
    • https://luminex.pl/upload/file/vuzufofomuv.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1f0cc4ee81d78424a1dfcbc59ec2ba7a/2013948549.pdf
    • http://breakevenpoint.pl/uploads/editor/file/binuzajoserileviwaf.pdf
    • http://nowyhotelik.pl/userfiles/file/98811514465.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6a5fdd26fc1548405f923cbd543b5b4c/6761767561.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5a993d4b---4207840594.pdf
    • http://buchtel1967.com/clients/26382/File/86903842689.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e65834ebf---80515951443.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/28935761637.pdf
    • https://rugsinc.in/UserFiles/files/favipeluzoxul.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/vasawuwamalizigaluzuf.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc301bd9c7---zekifajerok.pdf
    • http://allprintusa.com/admin/images/file/gamese.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/siboxubexuzu.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/36988386916.pdf
    • http://ledins.lv/cms/file/pazozuma.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/pajiwinebanafokara.pdf
    • http://zlhk.ru/upload_picture/file/335778776.pdf
    • https://airshow-bg.com/file/botimixok.pdf
    • http://delannahotel.com/user_img/file/59714775271.pdf
    • http://yuc-fac.com/uploadfiles/20210704061328.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98ccd8544---kogekeregituk.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/fowopikozegenesexefufifa.pdf
    • http://a-mega.ua/images/uploads/file/60672020500.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=keep+talking+and+nobody+explode+manual+pt+br
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb7.bin
30aa2a1713d0b470fe53e1213b8e2b57184f32407055cace3793f0da38740139
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 29904 bytes
font_01_sfnt_off00013347.bin
49599dd59ecc148e3129d19b7c9d19a3f2dc51b233d63fd852c14c54ea8c1f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 3636 bytes
font_02_sfnt_off000141b5.bin
3b136b8f209899a7e2ee776aeecce1184d2b9f732a0f040d9bc67f3efbb56def
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 11108 bytes
font_03_sfnt_off00015b20.bin
44994e06b99b64f0ed5596f9ae0e7e2a7bc3ef52ee675b9f86389a3db485bf5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B20 20768 bytes
font_04_sfnt_off00017f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F84 16792 bytes