Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82960cc376ea08a…

MALICIOUS

PDF

87.6 KB Created: 2021-08-30 19:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e814792c0692951d662f92d1f0b1f056 SHA-1: 7a796e68bddae070241f8d31ab7a764877f45360 SHA-256: b82960cc376ea08acf5e045bc4c865f1563606984e5cc868ebd80b9486a3bcfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress installations. The presence of these links suggests an attempt to manipulate search engine rankings or to host phishing content, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://paneldeconsos.com/userfiles/file/89367016545.pdf
    • https://diaochue.vn/userfiles/file/lakasowag.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ba4928a1---zororiz.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2d3eca6aef302f04228c8a3b03ad9dab/54135392368.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab083b17c5085c970f4e427f677495e3/dijunofoberoxokexej.pdf
    • http://matsusushionline.com/uploads/files/jarejidijoxedu.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pawadaliwimikep.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46bbd58dbe---geluxekevi.pdf
    • http://benetalent.com/upload/files/19447984166.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm4kpcaglqunn2uguln8m5tb41/favazorenajazak.pdf
    • https://heritagecambodiatravel.com/userfiles/file/sewogasoxufoxovabe.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/22260060660.pdf
    • https://debcopharma.com/userfiles/file/kukojukij.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1fnvptgimpt555stl09j6b4dj/49950543390.pdf
    • http://arch-teh.com/pic/userfile/85999855408.pdf
    • http://dj-venci.com/uploads/pages/files/28522571242.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55eae7953---39996060559.pdf
    • http://dorapeyzaj.com/userfiles/file/31983569625.pdf
    • http://guowangcable.com/d/files/domirulikalukinewi.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8861a2a648---32797771627.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef5958704---befenumeposulosiditutenog.pdf
    • http://bptramptour.pl/files/file/rekoxogarib.pdf
    • https://amatnieks.com/pictures/image/wawubagaxelenawisufefazis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=writing+in+apa+format+for+dummies
    • 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_off0000f230.bin
1d84936a8499c361d8b57322bbed04c824a81636e8c72ec25da9504a9ff52f82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 17280 bytes
font_01_sfnt_off00011ed6.bin
01064aef20337e5544cfe69ca1e2af5f7b0a0542510b9e1d5cb42d45fbc1b0a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10888 bytes
font_02_sfnt_off000137d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16792 bytes