Malicious PDF — malware analysis report

Static analysis result for SHA-256 485540c06af22359…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 16:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 317f8f879e7f406895df5086b7344cee SHA-1: c415a96ad2c5936accd4a7b9cb6a89d10fda2c17 SHA-256: 485540c06af22359dd175a8b1a15d61ceeebd3047d07a5c21810d5f74ec134eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating a lure to external malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=upc+number+search PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f9b3bc81---povoripijanupivovapibigu.pdfIn PDF document text
    • https://kawanmto.info/contents/files/80001403667.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/62958742967.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/23796728326.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca18f74420---ruparijujewidider.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/zowojefikatinenixenuje.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/nedat.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/98317265008.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/9776396268.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/69817168445.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144458983527---43079284141.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_161732.pdfPDF link annotation
    • https://limberhurstgallery.com/imageuploads/file/veweliditat.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/8354849440.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/75362997857.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/3325586938.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b8838a762d5f92544f5dec0412fe8e13/rusuwu.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vugexigerew.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/puvaromobibivopa.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/jibosemipenevula.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/tumev.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/25729786994.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/76492339117.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/masasa.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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 16888 bytes
SHA-256: 90d2c79beb68dc1358d6070db662c3b158877dbe849b993d8094c90653553077
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10532 bytes
SHA-256: 3c5bdedc795693e4e40ab64a04a2ef9e7df0513c4a634e9b4037e6b8de978782

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