Malicious PDF — malware analysis report

Static analysis result for SHA-256 823710c9c006f9ba…

MALICIOUS

PDF

83.0 KB Created: 2021-10-04 16:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f02d1074f259bc30146078aff057be5e SHA-1: 462067d2d96fea99f76ff8b2adf0887b8dd8c4ff SHA-256: 823710c9c006f9ba96ce73bbfd0b61bc300d2fdb83ca27eb54fc986441ee954b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chiari-web.com/ckfinder/optimist/files/90985250652.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/44497625156.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1c739da59---2048303964.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/56096171776.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139590ceabf1---rofifabanodav.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/78022477974.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/97665642453.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/7583132877.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021102194642066.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xobokuzaju.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/xurepasapumulilev.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/telizimedopiwogazowob.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vonazufuludavuduzolawef.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/rusegikasu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/20162952664.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/14051908228.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/53610919684.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/jarukatepo.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/rajezinod.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3b4f42033---96472316876.pdfIn PDF document text
    • http://julianina.dk/upload/file/63842657243.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lorup.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c106b993d---fusokedidofurimufatimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=complicated+acoustic+chordsPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 19624 bytes
SHA-256: d583cf4bfbc17d0f4ceac1c4f6ab014b328956acf63623b43de57d033f8a6622
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10804 bytes
SHA-256: b8fcbfbc7b102653e36223305efe458e11a7091701b7c4e96c3c79df9bd286c4
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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