Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae05656c561f52c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0044da2c5ebad3d21f1e6e327eed5f78 SHA-1: 1605ea0a2341db74e73a240df5d4f9a4f3abde61 SHA-256: fae05656c561f52c9eea04a8893f6e594896044fed139cc8bddfaeabf2c4a20e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. These links likely serve as a lure to download further malicious payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sakaryakasaplarodasi.org/userfiles/file/zemekemajala.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3de45b742fa32e18578598ec5438ad5/xalarosesadomumagiwoxa.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/piveguwegenamozenuto.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/rubefofosakuwobinobavaz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/54117328947.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083915ce1a52---kigerutisesanigop.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75da9ab53d---15080143218.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7ugopngd58lbvtj2mrrpna1hkv/19124908870.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/kefinuk.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tidadu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/58298776185.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/790508996.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/25ed29d8b5ec55a5a9350efcefe61a0f/66859870383.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160803006c99ee---63502395383.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vonituretuda.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/fadunek.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/21217437114.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/48777089535.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/xedufekuwavuv.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/18328700263.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/5257773899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=autodock+tutorial+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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 17216 bytes
SHA-256: 6ebdcca1014816ad81a9f4938065e8d06e655819983af812e1c56853d392a77f
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10380 bytes
SHA-256: 4d719d243aa55c243d6bf245211c3e4d52507032150195983ee662b039b5d559

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