Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e8349b3f600c2f…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 109ce3a73328dbf09a90f4c78d4057c4 SHA-1: 9b81be496c3b263da663566f869189bd5f798adc SHA-256: 55e8349b3f600c2f85aa94a96daba7bda090c193d72052d0f533fdca45b58fb9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself does not contain executable content, but rather serves as a lure to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5793342b5d040e26d2ee1d5034c120bf/31026531142.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dc86323b7922daef9bd4070ed4a177f1/gadap.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/vogod.pdf
    • http://ifa-astrologie.de/userfiles/file/51826222044.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ftmaqtikn74fkhfqnou6adjmc2/bufejar.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6bm4fr3i7holrcfshk8c7odosp/doginebajosa.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778633b018---kuxagi.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c832b50b---1720011977.pdf
    • http://makesomenoise.hu/upload/file/38190507782.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892dce4f6f8---91626415801.pdf
    • http://4reality.cz/userfiles/files/temaranizalepujodukukapim.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcblhlsomeg46rpabkb5euur1o/sekitusazomajodudatof.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29077d344a---lowevixo.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/51544307097.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/knsjmg57r7q9jbardbansha5v9/bodopasorulov.pdf
    • https://igruppe.no/ckfinder/userfiles//files/tadomiwabulosew.pdf
    • http://candientushinko.com/images/file/vaxofabudiwut.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/bbbbb8c96139debe91a755aacb7482ff/xitamomebosebadopofi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160764cb306266---55957278956.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c0894924---sukurix.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00d38fbe3---vagelenejikofub.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/r68pcnh3gioi6i7j1hltf09bph/40556493836.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+male+chauvinist
    • 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_off0000ef9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
font_01_sfnt_off000107b5.bin
e6e7bee8fe2076cbd7bac325d35887c2dc2735147a360ae86e0cd0626389f3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10976 bytes
font_02_sfnt_off0001210d.bin
8893213bcaec599b4499e541b87a48b1500be205db857b5b203edadec61f34ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 20352 bytes