Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a34acce20368f2…

MALICIOUS

PDF

100.1 KB Created: 2021-07-04 14:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21900a888de69f475f586e4a2e00a2d3 SHA-1: 41aebb0979bd5f2c446283d12422021082b7b595 SHA-256: d4a34acce20368f284db91d2366ccbd649a88486f3c4344bdbe188c847d917c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://synerhu.ru/uplcv?utm_term=charles+alexander+fundamentals+of+electric+circuits PDF link annotation
    • http://softwarefactory.nl/images/file/mazifalag.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41d8e2baa670ecd40c91e39ef9a904b4/puzaxekenimurikemifa.pdfIn PDF document text
    • http://isgsrl.it/images/file/1498007320.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/19080583351.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/weladiwital.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16099f317427dd---22144771675.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ru0s9nebafbojbgkbm0o0htf15/44065363288.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/o9sa29a82kfet2ikpc30e2hh15/54051256634.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k5umdvbmvjjcr9t1douhnoffi3/feraladi.pdfIn PDF document text
    • https://angkalaris.com/contents//files/43519428854.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/69953035011.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062604304373499.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/3234071298.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/133aae16b0934356a9ca8d002f411783/tibulexivonekuwaxuwuja.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3a979315---74722036336.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/203a1d5fb4ac9a041aeba886ec19bbbf/45711837751.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/538e75e3de269ee552d04c6352050a80/lojiw.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878b9ed58b7---90213232033.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c14e1cda3---sobilevokugapusog.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b11e0f95a0c80aac22779d59816dfe41/36487739903.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/mogipizimifijitodavok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pekowevud.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/662fbd6e921216caa79cb94d435ca7a3/kuzowaxaxed.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1c0f32d---boxexagigituzagonol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 34808 bytes
SHA-256: a23d871f2c2c77c0a9042c671089a42b7b3611a21380f87fe5860e4ac41ad1aa
font_01_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 10972 bytes
SHA-256: a573987a1d785597f52541a80db6f9fade60295cf2d64f1b419047a6fcfa9840
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 17008 bytes
SHA-256: 0c9b8827dd99451283be31020bdb63a07526022e440b36d93e256ff4b8baa52e
font_03_sfnt_off00016a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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