Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6260352517cf36…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 07:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 831aac4789f6e5845174c21341bf9618 SHA-1: 94d535530feba6dc0fe58ee978463fdf24319c39 SHA-256: df6260352517cf36d7495e25d0c140429ae51c68c0ae3424247c59664bfe004f
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 CMS upload storage or disposable hosting, indicating a link farm designed to lure users to download files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.tempshift.com/app/webroot/files/uploadimagesfile/23895531118.pdf In PDF document text
    • http://phonphangschool.com/upload/files/69707448339.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/13709712240.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/lipelexusabumutepo.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210917_101819.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210915_170617.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b38eb642db---80333531137.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/i4ik93k1eila1pbj3odbtbboak/72692503257.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/64045761248.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/fenezisire.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/23419815157.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/25873855926.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/99729790941.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210920005616.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/41979939282.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/subarisijeli.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5e8d531c---41758970319.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/16898511404.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/mabowodawumafi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139069ba5826---zuzitarenibefawabom.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/25424447647.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/runefim.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/62710883638.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/2717207992.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/vixavopejegog.pdfIn PDF document text
    • http://esejsc.com/upload/files/16440846737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+80+days+apkPDF 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 15988 bytes
SHA-256: 0b248bf7cd53ef0b48be52eea1d20b8b95e1953be164566d1ce203774df10cd0
font_01_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10584 bytes
SHA-256: a86bb988ff76748167402a437e8bc623e13484663b2e81314c7980b75c073030

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