Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74521ccb8df6bd…

MALICIOUS

PDF

77.6 KB Created: 2021-10-13 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c35ba95bda27a49410831ed43f8c2b2b SHA-1: b96e4c04f6c52542bf0e0ef8d31f07d3f815fb06 SHA-256: fb74521ccb8df6bd7219cec51a7e143bb2c0b42f2a7999bae1d5c63f4de0384e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://salonorchidea.com/userfiles/file/10786935162.pdf In PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/puded.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/jebibuna.pdfIn PDF document text
    • https://jagominum.com/contents/files/lamixosenotelujilasitatov.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497ac0b9592---zuxedimilasoxibag.pdfIn PDF document text
    • https://kaparatt.com/images/File/88526213465.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/65103423267.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af518599d2423e7b19bce76b2eb6b1b4/pujuvozelewujebanev.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/27935836136.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/zixitirajokara.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/66376500748.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/sozuzilulara.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161542baa8396a---15289558070.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/62636814220.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/xujifomutimukufot.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0895518b3---80255626055.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/ladetogireromevawijiki.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa1cdaf478---dadumozonoxetiwowaxeri.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/gelomelusubuzunegowole.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/66681716058.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/40557004816.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/72699368769.pdfIn PDF document text
    • http://chikatere.com/Upload/files/dodazazo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=watch+the+santa+clause+2+online+freePDF 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://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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 17108 bytes
SHA-256: b98069629cc7770f492fbecaf130fd12b686c64a93085d0a8fdb815b50802a89
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 10644 bytes
SHA-256: 8118acbbcd07fd4209bd1d4d536388d422d7e527f43e94e7ccfb2101df92d288