Malicious PDF — malware analysis report

Static analysis result for SHA-256 36115fd752a47c4f…

MALICIOUS

PDF

75.6 KB Created: 2021-10-12 05:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5936c9ffd226c8fc7323d14928abc7d7 SHA-1: 81714cf205892581f176458fe77104aa06b9148f SHA-256: 36115fd752a47c4f270c75a87640a304121bf6c37fcca05690ea59aeb4ab5ce2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, a common tactic for SEO poisoning or distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://schokozentrale.de/idata/44713642266.pdf In PDF document text
    • http://cukiernia.eu/upload/files/41881098436.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fekutopu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/srdjb9gd5jbc66l52clutcm9ms/97625120677.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/5585795294.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109131451093581.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e7f0792895---tabalorugudas.pdfIn PDF document text
    • http://onelove.cz/file/funekejosufofo.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/20700381544.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/9788285229.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/28680431105.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/26215273918.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/79182365035.pdfIn PDF document text
    • http://erdbau-rauch.at/96086269490.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/co3a278svqk5gnb5ovmi4ck583/77582020430.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/tonupajefuxomimediv.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/52085348308.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/16073081957.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/razebifogokupopogixubi.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/4572732317.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/zimuruwikevinop.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/rubadeperiran.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15e3a35ed---91368079778.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///9145238863.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/85839554217.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164e38e8ba6b---57566167155.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/89429977288.pdfIn PDF document text
    • http://sayarbobinaj.com/file/tarikuzitom.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=cbse+7th+social+science+book+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_off0000c0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AF 10928 bytes
SHA-256: f6cc76932a850de05a9afc37e41cef2b4d0b3ef5c3e0380bee170e8338fa9f41
font_01_sfnt_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 18236 bytes
SHA-256: 05533a506fb8d236450977b82e7a4d9eec13a27edeac8f48098662975dc6aeae