Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d07dfd796481b7…

MALICIOUS

PDF

97.6 KB Created: 2021-09-13 04:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70b6431527cc6aae70a022141937cc0a SHA-1: bbd387483274726d8db52bab6bd019b1ef8e34eb SHA-256: 33d07dfd796481b7f25604d5834ae05805ae24cff2d7b487dee268ce0fd65755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to disposable hosting or compromised WordPress sites, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://tyextractor.com/d/files/gategaj.pdf In PDF document text
    • http://xahuaheng.cn/userfiles/file/38221272797.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/77426809995.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jaluke.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/70641324455.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jadigobewipavagefisizin.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/pevofedujuwivamigokijis.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/94521302716.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/65876954834.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/84807859286.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139159bcf8b0---72755206395.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139389a94de1---69901012060.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/62297331402.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4aa018570---zodoj.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/11626183971.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/35813896986.pdfIn PDF document text
    • http://rivucota.com/upload/files/wizab.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/nakinasexewizamowunopel.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/wodujadotimemixup.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/93006853574.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/33981831522.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/74602911417.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/binudopujutibile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dragon+ball+z+supersonic+warriors+2+free+download+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 23244 bytes
SHA-256: 8eaf433743e38eb6297a76fd939a49f98d180d312f372bad12825e8468126df2
font_01_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 11204 bytes
SHA-256: 83f55166516313633d75fe2cb512ae4fefe653d375fdfcecb5e00a0826d3bdc9
font_02_sfnt_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F47 16856 bytes
SHA-256: cc4fce42006ba268edf83ae0fca508279bceeef6103c3d2a19888f491def701b

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