Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99f21d498a8a1b8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d3d47b58dd651db0aed1805abb198a9 SHA-1: 5c0d6a36a93c4f75f705a724e602508c049e5c77 SHA-256: c99f21d498a8a1b8b4b26bc6bd89963cd6fd6fb59c18586c1594a4a37c62f760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, forming a link farm. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441db54237---31381456468.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160817a011e148---95022233194.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc986caf0---xunutizuja.pdfIn PDF document text
    • http://atek-ent.com/upload/file/komofisozabul.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/77043835464.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b64e984580d17d5e9566ff93e1763349/dipodif.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f9855c6d---27237657510.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/bibojodetafegipogijagatul.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/94906402915.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ppualcc5gtevvufe39vc1ljf6d/17952333709.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/60098150362.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f52f7b2387243d20c991ccf317f41bde/vubudedogarixosazin.pdfIn PDF document text
    • https://hirurgija.me//files/gilupipazibutowanopujepif.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/ravewab.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/77210051178.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072df3030816---45066096070.pdfIn PDF document text
    • http://rafaelokazakov.com/file/gadejex.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb880855ff6---vogisikedixubusananimir.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e4bd950234fad754ce65c1bc1cf474db/remazosibasevigigezirome.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/koxedabosafusaf.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/pifasojevatafetibat.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/57591816665.pdfIn PDF document text
    • http://sdes.in/uploads/nelulitotexalabogezon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sexy+jokes+in+tamilPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210819/16293178813339.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_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 10684 bytes
SHA-256: d525cb0d47360db42ded0222827b80f3028e5be7f212ca341da24286681bd419
font_01_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 18736 bytes
SHA-256: 19be1e6397d227efafbd15c0871604d61d9b67fae5ec01396d061b9cab6d89ed

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