Malicious PDF — malware analysis report

Static analysis result for SHA-256 5717932bdd219590…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 19:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45874f49c51df2fde9c6f71e1ee21662 SHA-1: 6f18b12a8d864825432f6479059b5b0756ed0dab SHA-256: 5717932bdd219590642b53bbbbc46eeac5db7889fb6a8b97cfd9d3eeacdbbde6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bestapp4u.com/admin/uploadedfiles/file/64168339516.pdf In PDF document text
    • https://astek-telem.fr/userfiles/file/wularijejodudirexog.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ef9106ec---21698284088.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/vefelalepazeloxusa.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/81797845765.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/20241763827.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60d295803---68292513168.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1804275740.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/tefopugorafi.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/15612335577.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/rujagula.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/51579858455.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/29949880192.pdfIn PDF document text
    • https://wagaskar.com/media/77220023069.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710243b1d---49656386062.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19399820076129a03d6110c.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/fazitib.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f2a73b01---zezepivotopireva.pdfIn PDF document text
    • http://pneusmarene.it/images/file/84875903976.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tirudiwitofebozipezem.pdfIn PDF document text
    • http://faradbox.pl/files/file/26634783274.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/47d31323cb2006ce55da72e84dd3f6e4/gudipafalidipalo.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/91241301657.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/15372569329.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118f5a227cd2---19069665619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=atlante+di+istologia+e+anatomia+microscopica+ross+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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 17668 bytes
SHA-256: 3c2349f515919b97509922433b140be6b243688b3edfbf1d47b4c313e08810f0
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 10944 bytes
SHA-256: 5d970d03b96b266dfabbdaffe562bebd6a809d9c720e99d70165eaf9f1099cb0

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