Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e2befd2d215aa8…

MALICIOUS

PDF

92.9 KB Created: 2021-08-25 03:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cefb41b96f061215883d51c9fc2103c5 SHA-1: f8de666356937909e301f9004d0bf2ba336e3458 SHA-256: 86e2befd2d215aa84db6b25701de97e6f6d1a24aba4585f79f167bec38565b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting it's used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=past+simple+of+stand PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/83hikoroj41t9d8gf7htbr9n1t/mivijofezewo.pdfIn PDF document text
    • http://www.bash.cl/media/file/bovirovana.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44030487382.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0df76b225ae3f2cb379b1bf9f6f9da68/fanopomonugoz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7k8h6cgdpv7hdgf504mlufe4cj/vojakerodagogawazaseg.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/31984104721.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3785f0d2e1---fepitovulibiserajadonabe.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56365087198.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/jezedo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/20fd668bb3e63a423b9137e67681fd5b/66612318007.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/88784676001.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/57047744551.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/luligedonifarofeximem.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ju5uge714mspqm9f2m94g2ii7q/tikexaxobitepop.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/42343519398.pdfIn PDF document text
    • https://fishuntpesca.it/file/telekikuvepodumokawow.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/vemidiwuwenurexopidekesox.pdfIn PDF document text
    • http://flomojapan.com/upload/files/34352674418.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108112212438071.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/garisalekogisulujudow.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/86120776878.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985f3367584---38841024519.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55ccc0326---xewud.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fubokagexuxipubonerudokaw.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_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16956 bytes
SHA-256: 5d5d732835b7cad25c5a58e63d8c6b684022b0d5c45aebe510b59e2155b5763e
font_01_sfnt_off000134e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 10560 bytes
SHA-256: 6d7c20633e1c3b20f26b9cc9f59fb62ed5ab54ab627721b7998804f083546a12

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