Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bab235592fb79dd…

MALICIOUS

PDF

110.9 KB Created: 2021-08-02 03:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c9538d6e5998d67c77c7714a24868c SHA-1: 2858b27d116fc90bf0450114129320f0cde3fb91 SHA-256: 1bab235592fb79dda776ef35423f364ba77fec75eedee65558cf99230f9a8535
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=mahouka+koukou+no+rettousei+light+novel+volume+14+bahasa+indonesia PDF link annotation
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forig.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/99392597421.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kajenobizajadozeganesazi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/39228689459.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e99d6069a---51674802715.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/31398652153.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/648ca0615def82a2ba8e2d0b8225b528/woniladugatedenupavibamu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8daf965f22---29430227830.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/68787359401.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e9569fe1---luvezejisefo.pdfIn PDF document text
    • http://topas.lt/userfiles/file/domal.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/1017611406.pdfIn PDF document text
    • https://ikansambel.com/contents//files/12836908950.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/makanokuguwubupa.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/90638309272.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/relotoputibuzebis.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7c837c96fcf3f765cd55b69cd9b9970b/xevere.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/pawonikabikop.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/fataremer.pdfIn PDF document text
    • http://deforma.it/userfiles/files/17733228347.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c628a3be87f03ebc57311658836da8ee/lupabojazonolirapinejabox.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_off00014e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16682 17244 bytes
SHA-256: 81758babf6a3313ab6bfcfcacdfe18bd762435dea24ef158e1f3feec2211b272
font_02_sfnt_off000193a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A2 11216 bytes
SHA-256: 430b531e4411de58f157812e73ca687b7b20455ef47045de93760ac6293988fb

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