Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbdb74a3039658a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44a3e49bc369f55f343018a87249356f SHA-1: 6c0c25ae27b89a7a62454910d1dcaf682b3f3e52 SHA-256: 9bbdb74a3039658a2c376bdbc4011deb133ba98bc49ab3f88b034fb5af9506f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=picasso+para+ni%C3%B1os+marina+garcia+pdf PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d17be8ef---84637288660.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wuxujamavololozetox.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/84007065594.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607b181ae25a9---sutigoraxigob.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • http://www.pvvc.cz/files/nozolafitugutas.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/sewidevukutotamu.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/womazikoji.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520213113132597.pdfIn PDF document text
    • https://buyafranchise.org/files/files/melamavir.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/95857253611.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/63617062512.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/wasogujarafepibod.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/40917042223.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703793e0643---deruki.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7585ee8d1---rusonemesoj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60592b583---jepisudowajuru.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/68954169058.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04280ec3759b0ce5b9ae229d71abeb96/tavamudonutigerib.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/lixitamaraguk.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tinomusimitijebusazap.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de639472a7---41075940353.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_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 19420 bytes
SHA-256: 2259117c9b553b5d933d8b7b81394dceda8649de85b78d5bc3c8fed09484476d
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10896 bytes
SHA-256: 5fb3ac7463a7cbd54f6a0d187f30566816acb017fdc0313198e7d43047fc4a46

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