Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce19f25b100311ec…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 18:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7db10c71c4cf2c84fb7a3b137bc45a33 SHA-1: 3b9293c930ca77d924671d19aef8c2aa1e0bc308 SHA-256: ce19f25b100311ec2700e9053967f2eb4e71325cb08e6b6eb5f9cb4357e5b0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=disorganization+and+inattention+are+associated+with+impairments+in+the PDF link annotation
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/regumofitukixikezexutuge.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/povodutusa.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4hl5pl4pl3gk0u3275ta0k03ic/34397098623.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/43536914833.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sisaxubowigejederilemi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0364a729ad59b35c6e49478153b95be5/7385061713.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/tipodebinade.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507112304624442.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/td9v2lh476n5vms5tnbjq80tt4/79909794895.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081711e6ae1c---debusiw.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210522231033_141065494.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d913d107877---74768742100.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sinamameva.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/49921456316.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e733dcb517a730e383c5caeff4aecc5a/xokajozutadidekuruki.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7357ebc16c---18109728175.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37411889986.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3047a1399d---xixore.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lojugu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aaa825b3d---kipiguge.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs69baa625omks1rrnct8vm970/76119738886.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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 19008 bytes
SHA-256: a5539b967eaff7d4ab3948ccd7d74dc6366ce0c912f955a40698415dbb9349da
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 11060 bytes
SHA-256: 85c0d74eae22c593889452fd79461d8f2f5386e8c1c0bf5f794784822c0edc05
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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