Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d26697fb81c7e7…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 16:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5376091c23027d2229378947ccc4f281 SHA-1: 17d33fa6df04d73d60e812ded94f7fe65ad9ff94 SHA-256: 24d26697fb81c7e7671d2815364e804d5334562a406ff079e7cc3ba6ec3445e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.reenactmentmarket.eu/images/wyswig_images/file/58755112999.pdf In PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/70140626334.pdfIn PDF document text
    • https://luminex.pl/upload/file/20747869507.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1t9mhbh9gjpgbie71u9kf8g14/pekex.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/zixuzevedigigemavomana.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ce626148---tipuf.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/refegokuragoremu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/84775237623.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a364c9ab034---54790027993.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/58595756199.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/vavagepizupetegikojotexi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/beperovavazupijutiris.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/tirusovigowolivim.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xowajanadula.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4ded89cda64876b75a52fd149cde270e/64662410373.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbcb97d43b888d6acaa6f6e8f28b2f39/4720046787.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0d68ebbd11518f4ca79d1184e82bb587/20568600972.pdfIn PDF document text
    • http://candientuvibra.com/images/file/pavasewekowadufazobe.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/655a22cb77f63dd62e1dac48120e7ccd/pofebirifizamidubogakig.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05faa238ca---36327600933.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/13311114785.pdfIn PDF document text
    • http://grupophi.es/uploads/files/gakewoliserujadu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05dad1c2ea00954433cb763443bf5617/tosebopibonikowuteruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+greatest+showman+2017+movie+guide+worksheet+answersPDF 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_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 19276 bytes
SHA-256: 5af5ef2e4467567cf5f0c13318ee89455f662a9b4a9d1307602dd01e24506a3a
font_02_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 11300 bytes
SHA-256: 4a0b93198c6641afe294712277fe750b04f664a8471e0241b2cc4124457c2a0e

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