Malicious PDF — malware analysis report

Static analysis result for SHA-256 2610712b0eae3766…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 20:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd16b084e00c2ccf94df99b382ba7a8a SHA-1: e75054842bf1beb52c85b2f42a5281dea8c2ea14 SHA-256: 2610712b0eae37667940584a35bec782e87c0c9b4a2e14af252eb7ae649559b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/be44a416e19afe02e6363ec81c2970f1/82537394861.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91603496c---zepevapogozezufedaminuwu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7322d27084509039a34ccfad0dde76d5/vidorekudolepuwuvugu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afac8947194---23159328498.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zokulijukubanufojiv.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/jsh0qrq2fuisb7f19r9pupq0d6/loxebeluseximexituzafol.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/87216408206.pdfIn PDF document text
    • http://hkwwta.org/userfiles/felazifuxe.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/15695522892.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/43241466141.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/50529794347.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3b68b5b8940b9bdc7d546b4b66414d8/5973056115.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/61537191039.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624543850.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/58173901933.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/16195607702.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/530b0d4a11d4387e2964abfca04286b4/sozevagegi.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/90441105790.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fdlnl1npbl5aj15q0mbsgcrdhp/61173721240.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/dunuv.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c7d7b400117d7a66d370a8393f9d9d48/14608939983.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/58654641246.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/domizadakan.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/3831382301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=meta+analysis+and+systematic+review+pdfPDF link annotation
    • 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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 10920 bytes
SHA-256: 5092bf550016852cdd4f40a29ca41b2de669691deea57992bd35ecc46a7c3e27
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 17968 bytes
SHA-256: acfd337161def8d27110d7ee0c525bdf7ee3b4914dc82d9b180a2afb85a08810
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1