Malicious PDF — malware analysis report

Static analysis result for SHA-256 284c0d0800e15fe8…

MALICIOUS

PDF

103.4 KB Created: 2021-08-17 10:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c33b439f01a910d9f0e0bdb0601acf3 SHA-1: 63dcb61fa7c962078f4bc86fd2230bbaf8364ddd SHA-256: 284c0d0800e15fe866696948b8ef184704636ba6b9acf81ba5ba9db620221931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f6ea11ec---50268438447.pdf In PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/ketuvonuzepesanakagazo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210617100905_m6xdki.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/90683904180.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/89267792821.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/51726222364.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb7df1b67---88836190475.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/gugate.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f38f3cbf4---monexatozijutoj.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lerokinevivenuxogitoxono.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d82e4ab3d---35035324185.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161103508873cd---varalekuzujodevasexifuj.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/61d21c1c860b7bef46e4c1c5037ad4a8/wefafas.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fc839a14d4ab45e2292ec216e72b4283/84542610086.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/11763512057.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vr0038vfdf8dhm9t380bkha9u3/sepodenuforobadafaruzup.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/xunodef.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904cef0d1f---padofi.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/8tjb21t20cegk273htv0otto05/delimosokizoxuganiwuxija.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/37cd59e379e4ab4ed71085fd74b16e46/mezexib.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadd6474bb---97708617920.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d638c150d88---68796190006.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/pogetojig.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/kadifomuger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=why+is+my+dolce+gusto+machine+leakingPDF 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_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 18696 bytes
SHA-256: 01415385d61f33bc8354d9c367958b985e0380ff8ea79cfe988b51c7776cd3c0
font_01_sfnt_off00015d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 11016 bytes
SHA-256: 89c024ba6948ac3a5e5d18ad68404e6bba3822e7fba34f32157c57c5381c9c54
font_02_sfnt_off00017667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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