Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff95fdfd21f2e6ad…

MALICIOUS

PDF

82.4 KB Created: 2021-08-20 02:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4e7ea09700c57f4e6fe2be62bac39e24 SHA-1: 710b7e2f33ccdfa8e1252bc3c9c6e43c707a6fce SHA-256: ff95fdfd21f2e6ad3d5202a5a5fd2ac912e482d39af3b9e57e46bc394c099b3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crewmak.ru/uplcv?utm_term=printable+calendar+june+2021+to+may+2022 PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ae5cdc73---seloguwefilezemalazoxeda.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t0fvdid576vhgbm6o2hb9qajp1/19046012751.pdfIn PDF document text
    • https://papiratisk.cz/soubory/53564864275.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cv2bdlr0bsfgpd5tjuip5s7npp/45071369792.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8b7aec1c7080c05fe8aa0f9ae722b320/79373371270.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5e0th0q1eos4ltmrugs98eegu7/lofibezusisidadepevomasu.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/fibeledupa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc84ef726cb---lapiborujexe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ed9e0861---nesijovow.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/93597439302.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/83605427203.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16102b87af361e---98525908934.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8cb1f65d---19476784446.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210623_0A8D229CE6F432D0.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/bavolexoxukiziwajoginaka.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a104d2fff398ca805dad66f5f94f1cea/72380913098.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/sagawopo.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/vipitunasutun.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07df5ec00---37839821187.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d220bfca---26698249017.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8368da6c---xedevizekoke.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/vamuferudaduponol.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b673416c633---lalukuvise.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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 16152 bytes
SHA-256: 410749abfdbccb66bcc850a11c6d428ca4778759994317cdfebcbb12de402c11
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 11140 bytes
SHA-256: 4c01e32cd61031940fc8effdcc78a8b0e8460de0d89e957f4845b2287dfe8c3c

Open this report in the interactive analyzer, or submit your own file for analysis.