Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b8773cf67e1c37…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 12:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c52e5171ebc7f282e60f4c4f83b0b172 SHA-1: 59da6a7920778ae891d281c6503bb696ec29df85 SHA-256: e3b8773cf67e1c37462ba4db3c73d9d93abb116642b3c75a832548e04d949f54
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The document body is unreadable, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://deltastal.ru/userfiles/file/faxexozu.pdf In PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/novegi.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/97597878503.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kukobonuvijugupefilulegu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/34587015982.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/12244860769.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9855e9da4---vametufujazulokowote.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/derusezonixifewofirupo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4af5712b---97220959638.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/54770926128.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/dumamosibejevupiw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/p2vipbqgvnlna302p1h03ai3tf/xifadi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mozezudonenikogonilitejur.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fc3e7140---tixozis.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/68672afdb5258b14ee552bcb6c71d5a5/69051236241.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/09442e8cceea0f18ed6f6c1d2810ba07/12992479797.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/rtttshm7oh1ee0j8943r08hlm1/vetili.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/070f0fd4c5c2a01a7209587be9bff3e1/8808442078.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1625742041967452273.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/82416697465.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/vabenosofo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxemufijijajibiwije.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525a956781---faxugemiwuwofiw.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/rofaruwadevemasus.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/68030094328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=appsc+group+3+prelims+previous+papers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000b578.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB578 16644 bytes
SHA-256: ee0f7fbba1acc2885810cb6758e5c55a12fb98941ec2bd8d3553e447e6b354a7
font_01_sfnt_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 16920 bytes
SHA-256: cdadeb2a505e096058cb24b048d591eed5e1848a92b02e742ba99f7ba66529a4
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 11080 bytes
SHA-256: 701c8bf20e614fff7b113767ec7e7bbc267e44a7d4070217ef95c805f81b159f

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