Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b7c375ba8dbefe…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 06:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d9f9cfbd46dd48979b6306b1e2aac6c SHA-1: 881702317441b6924b026a985054b00d11ce6302 SHA-256: 55b7c375ba8dbefef232e7ff5cc7d08b0c88ea3096b882bda9edc658e78b5a3e
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. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate an attempt to direct users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c8884639e6b---95084094625.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/92cupddgp9jpe0ii3vs15hgdbb/nevetupaporajotu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accb8bc2f83---25012568983.pdfIn PDF document text
    • http://dgjst.com/upfile/file/lurupivuxidasasi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b297902921---forotiwodin.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/79946630958.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5mkdsudg9ektsj2r4af69u15l6/jasagesoxunavevoveg.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210629_EAD995FA5FB34A16.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/43796634543.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/osecgm0fvbcgrv3ekefbpeuj3o/besukalelozezufoboloreg.pdfIn PDF document text
    • http://accronline.com/userfiles/file/rebosozudanosabej.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/76658873563.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/xupafotufo.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/67950333073.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/filixisufazeli.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tejavozufowigawesa.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/42103442389.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/44009955171.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9cbos60adrqtfgsirn3f7t483r/rozame.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129d24681a79---fesasaxobakodazog.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/79022438779.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e22534f0216---wapakilomevazukerafukiw.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pibipupogugola.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jinadezun.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0bcd83a04b83256e4c0c77ff8924ad8/vowibogoditemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=math+adding+and+subtracting+fractions+worksheetsPDF 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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 11120 bytes
SHA-256: 4879d123d21dd09c303e3ff1079a3d84977be65d0020326f80d772b3c5eb90a6
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16200 bytes
SHA-256: 5c98c5386fb37bfa4c793ad416f9a328aee49b34e241d8b3d308ff3315591a99
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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