Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a7b0be37e58f4f…

MALICIOUS

PDF

82.8 KB Created: 2021-07-26 05:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfbebf9942c93340bafdd09f1d28c14d SHA-1: 2db0bbd1cfdfc05f64d658229bfbfa68b7a1bc63 SHA-256: 90a7b0be37e58f4f97a45f047bb2b1c1266e7c1d032f87e0109840deea897d63
184 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure of downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kcdm655nqs00ujiv7epldks2i9/74744463840.pdf In PDF document text
    • http://seamcc.com/UserFiles/files/fikinemevifazodiwupuf.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dglc37r5n8hqvnpb7l2ns9jlis/87996074423.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b9c730dab18b12fc14aa4db523779580/62406084280.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/58b92bndbioo5757vibag62nob/63480002435.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sexinizumoditobo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bed9f94c1172782e3b5a02cf0a769690/bapafe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b589ef14504---12200088672.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a2dc989866a538bad25f027f634d1639/32620105263.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471b211df2---malalozuxeretaxilamaz.pdfIn PDF document text
    • https://armenia4d.com/contents//files/38866409668.pdfIn PDF document text
    • http://erex.hu/upload/file/robivefefilupadelava.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8255281661.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/71925911997.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/marofavetijesed.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607979908b47a---kiliwiruselatade.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/wafotimomenigenuniwika.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/keroba.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210604_204955.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160948709de563---lirutugoretanujukemefu.pdfPDF link annotation
    • http://pnmanagementsolutions.in/uploads/31451436014.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xugevonovoxido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=textbook+of+pathology+by+harsh+mohan+7th+edition+pdf+downloadPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/denumuw.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 11492 bytes
SHA-256: f6ff6f01c90fb233832870d8b002f4214f72c9e062f98b4aee886e23df722db4
font_02_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 17176 bytes
SHA-256: 0ae72d2acd8638223a3714034ea186b232220fc2c0bb46b19e17696aa48c3825