Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9c47e4ab2132ef…

MALICIOUS

PDF

104.3 KB Created: 2021-09-04 19:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a41b2e61a82af909d8163a830613c048 SHA-1: 9f74be41d6e9ecdba126f684d2e62ec9e88f5551 SHA-256: aa9c47e4ab2132eff90403adf0f7a42b5b9da2d8bf5e3c8b0ad5bf591d5afde5
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external links and the nature of the heuristics point towards an attempt to exploit users via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://portugaliaimagyarok.com/ckfinder/userfiles/files/98479217759.pdf In PDF document text
    • http://www.grifin.sk/files/92135125378.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/90176555048.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/4624385569.pdfIn PDF document text
    • http://deauville.ru/files/file/97152740555.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vorixefowew.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d6db5f53---29818839631.pdfIn PDF document text
    • https://inncredel.com/uploads/guxexigu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed033ef791---80875484628.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/56409645794.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3581e65d---42768213809.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8881d8d283---witidepinusorawofusafi.pdfIn PDF document text
    • http://uteambio.com/upload/files/46673857098.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/sixuvapugupenovavadef.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d705fecb---13795132592.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3b1c5d8cf2e7d3c3301db4282805548d/54869335706.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/86465403530.pdfIn PDF document text
    • https://inncredel.com/uploads/94765415739.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/kowew.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/72192506808.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c3cc2bcb---koxojibegerizovur.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/wifivasu.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vadumilupigirelikare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=color+atlas+of+endodontics+pdf+free+downloadPDF 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_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 18196 bytes
SHA-256: fc553c43bb637af165acd96196575e6a1834cf73b907f1d7147e50c3479110cb
font_01_sfnt_off00016259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16259 10728 bytes
SHA-256: a114f157f36b7e27e4233971e45f7a7c30ce5c3e8ebac1f37c7622a30ab2e4bc
font_02_sfnt_off00017b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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