Malicious PDF — malware analysis report

Static analysis result for SHA-256 63db4b5314d4547d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 12:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da0e03f1b90bd73e75252e7ce35c2be1 SHA-1: e5465cfff3cde05e801028d33a13e94051c3d423 SHA-256: 63db4b5314d4547de809b0f6126e23a092313587bb38c7ec3651738d4a961e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://bsp-plovdiv.org/ckfinder/userfiles/files/45314941590.pdf In PDF document text
    • http://gfb.it/upload/fck/file/68938675845.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mlbr3l0ht4q64g0i1nkt8s33i3/danelepoporetasub.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/mvcnm3o5gladkriqbpaqh0t3sg/46173631237.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd93eb16a---1161297094.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f566409a625651dba082d7974eb0cdad/75337957799.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ee5c595c---nutupewuzirosumaweluwa.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/57150299753.pdfIn PDF document text
    • https://posh.hr/files/zonipefuderagifig.pdfIn PDF document text
    • http://dytac.hk/userfiles/dukepefexutelase.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/juwodupi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qvsa5m55g2952fq9p1i2n6gtov/35045068736.pdfIn PDF document text
    • http://onelove.cz/file/2590940530.pdfIn PDF document text
    • http://rayanchem.com/d/files/22386973429.pdfIn PDF document text
    • https://loctra.net/userfiles/file/88521740252.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/kenopukefuxude.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160994c863b193---70004277578.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/09o63au82acver015sek497unn/86950456355.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/63421249309.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vegimilakedigusuritoxopi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1bd3b43b---xoxurasari.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fc97bce04c19f1fc379ec83f222de1c3/safiraxiratekutesob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chapter+18+acids+and+bases+worksheet+answersPDF 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://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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 11176 bytes
SHA-256: 7daf1b2f2df01d1cad84315ff923db1ac8241578b8050956b81cf49f98634001
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16964 bytes
SHA-256: f7b98486520e5837a6848f1cf34e08dfd967e78c9e1ea1cb7c5c33305854e5a1

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