Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfa63b1b015b10d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 08:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: febaa51300e967c65f80097fe8e04a10 SHA-1: d3049f8091573c66bc7aa63d8f78a300220bc71c SHA-256: bdfa63b1b015b10dd9fa1ad2f5df14c3ba559adccb9b363c403127cf7ccc2f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=video+consent+release+form PDF link annotation
    • http://hutergroup.de/userfiles/file/54733836562.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/20830808738.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607575a06d0c7---69925319121.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bde897e1---56875491748.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/27255547314.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db58960a7---80341670542.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/sevaxuxiduretex.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/gosisi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xipujajazaxowunasup.pdfIn PDF document text
    • http://temple.mo/userfiles/file/17606067735.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n1876mli6qcbm8873oo7q3kch6/54481334619.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8k1e2lbat9bf6ifp4dlsko9h5b/37793085034.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/jobofu.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/setelewurodelisiwumegoze.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/14488157238.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/bexokesamuxuzopipe.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/16966085916.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8c80428601f378de9b27a36c6956e087/84751577204.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690d1639e7---90931650210.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ab35300b5a95ba0339d410459a2a5fe3/vopabizud.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/65121898359.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac096ccf51a---2933012719.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609da238672f3---49533368160.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/67704281721.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/19401074358.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_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10608 bytes
SHA-256: de58c21d2237336640c7fe5723db3181deb9f1b2dadc25bafac7c226146d4acc
font_02_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 15460 bytes
SHA-256: 42b72f914865e5826e345ec2cdc032b033124cf6203e8316ed69bf726fe560a0

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