Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bb800fb5a49e52…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 08:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c135d764dea65b3201d4569c077f7ea SHA-1: 140ab44cff3b73c0a087d11be7d98f1336171dfd SHA-256: f7bb800fb5a49e52069ec1d9748b0e6c89d3bda0a8629891c1b3ef5cbddde9f4
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ks4073.com/file_media/file_image/file/sedojasebodozufalejexi.pdf In PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608060ebb8b54---33104719628.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/ruvomeduwotifavuzavemek.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zadugeseliragagidok.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f843a0b26a---ketojigazorono.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/kumomuzedonezomem.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/63180376275.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/denegoditatozizuw.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/sijobedakesonuxeluwet.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/72316938029.pdfIn PDF document text
    • http://teresachild.com/upload/files/83000102560.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a635e4d2770---ketumasawowo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8e830d4---77681443372.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/64337666265.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/81295824423.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/89153032438.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/38902158006.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/61002943903.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/kegejasonukimibunazuzipim.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/28479503399.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843077c1c6c---bumeliwekipilikej.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf54eef0f4f---5557764769.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad496d77c7---9603769266.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d0506114---20810597785.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1173e2ba1---98179708203.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/97319265867.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/81248302571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=super+conductor+materials+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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 10956 bytes
SHA-256: c0b201049e5368c10025437769c0b1b7060e88e78dba21a4dff0a0f0d7aac4fb
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 17324 bytes
SHA-256: e143b09cc952bc559a7adf2e49894128b757cf1d9c20b02007f3b6378fdc0213

Open this report in the interactive analyzer, or submit your own file for analysis.