Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b7693bed39325a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-05 08:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cd0f656fc796198dc0e8e45d38f6087 SHA-1: fbfd5fb4dd7df5dc183aad8ae4fb26e46c6480b7 SHA-256: 37b7693bed39325a885863303b01e35198ec45c7e0c2e59eb1f45b83a247df46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating attempts to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aldurra.ly/images-editeur/img/file/25021690367.pdf In PDF document text
    • http://frangarcia.eu/upload/file/bawaxuxapozetawet.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eas8i7pii9dr43va1obk8b0t45/mafadagidisas.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/94229439344.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2726fb1d5d1b8e66f79538fce17c7fba/zetotoderotizirataxej.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/68413016352.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/17672168317.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/pikilavigakazodojob.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/towede.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/47515623826.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b721107a9ce---kusijotivuxolumirol.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/30578e835ddc1386ae851345c89cd0f1/desuluwefusevefusobaripiv.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16106198ed6598---14196152622.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/jobejuxejipasetorudafo.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/tadeduzazifirenesisuxep.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/12063842529.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/getepabilikawaz.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/rikogo.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3d7a3cc945cb2fb91c239dee46631c11/72080603797.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3f6af133749b28eb163613307e8893e/tizavinediwesez.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/wotasotarijamet.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c25901872bc---gufimasirubo.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/61885559153.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/tipuzifuzezobijofidom.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4251837e---72089308904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=open+source+operating+system+list+pdfPDF 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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18120 bytes
SHA-256: 4e85ca04d0583a16950c9d97dbcad456de4cdf0e776d37e7cc42135bd8ea6f33
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 11204 bytes
SHA-256: 685f09478f5da4e5fdec73c461695672560d8d4164fb878fda2237e54bea2851

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