Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e791daea45799e6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 03:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d847d1849699633ab1608b988ddf25d SHA-1: b799113d09f92ed64bb3fc527374beeb5468152c SHA-256: 1e791daea45799e6340dbfefb5a0a24dcea2ab994e4f211ca0fa4c118ebbab54
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://agendatourvietnam.com/hinhanh/file/58489468727.pdf In PDF document text
    • http://roxburyhs1987.com/clients/63080/File/zefomowefojajidokox.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/q8iv6tvrks100tq58h700ckbla/3426282466.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084085987ca8---jijilefubovoramulijokuxix.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1613b14dcb---baraguxoboguvosozu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd65ea77a---84270852179.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0d08ee05488772145eec3b1c9981f3a1/33395534442.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/82253135345.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc327079c---mivewodalu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085242bc3bdf---53767184801.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/474e87a495b612ec2a4b1d213108fae2/lenedupofizun.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/76192859316.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/nefuvilegibuximo.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/sibelugotusopakupewi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30bbcbc9d---65387121894.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vironigugutawelawisulaze.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f2321cfc---kukarureki.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d281762cb39b966f9f7156027cd0c27d/xifijako.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba1339e07---sabonisaz.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bopegoxap.pdfIn PDF document text
    • https://oversaslogistica.it/file/lerarexarimuxawuja.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fea7b847d---nujuxonubosa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792a912de88---waforunulubisavesixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=further+pure+maths+textbook+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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 10932 bytes
SHA-256: a92860d27dbf293f25448fca84f21b0b3e55a9284111180c71ded9901ebc7209
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 17544 bytes
SHA-256: 95a45a4db39b7129685b0dddb2c9500ed4cf117c2476e128bcdbf27feba2e8df