Malicious PDF — malware analysis report

Static analysis result for SHA-256 a012238665b6330b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 18:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57b74fcc2e730b96da2d56b14146ddd2 SHA-1: c9dedf8a894986fc9eb6452351afbb0648a67a8d SHA-256: a012238665b6330bd6e5ee45aaaddf160dc5ca14e7215b42db4c7dd49bb7e112
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a link farm on disposable hosting and compromised CMS uploads points towards an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132927cb8116---joketifokakod.pdf In PDF document text
    • https://www.karelo.com/uploads/File/94111405783.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109171549546551.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/sotasamibapixomolu.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89307544702.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xawodogemigunopipoxukolar.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/ronaxowukaverasi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/99417361881.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lisokokumezamopejawi.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rarixosiditavifawujowem.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/93269269271.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/fedejimeluvazizidise.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/busowulufejatukasutugode.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137978994dcc---xaronavuxiw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/37e29b84ed749958192ab77445d436db/59243558993.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/xoroxejawopaxebezote.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/32411237380.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130628410b17---bupiwabe.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/junusebizuvixifixusipar.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/mobuzozesakelezeji.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/33453821680.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fogirusafed.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/wikinelexirudavowem.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/rizepuxujenafupapod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=apk+call+of+duty+black+ops+4PDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 18000 bytes
SHA-256: 0ade46171c9888e6a323e76027f4ccfecd1571ac1d7f0b91817f0fe1b0a939fa
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10688 bytes
SHA-256: d87e9d7a5e5fbd96ac07d9feeee21eb9c54f0b181f1ab24755b3ec3305b425d6
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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