Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b52a99f8018c0d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 04:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb30033f00e6fca95efe231212025f41 SHA-1: 67332d64f35a3ad8160330b96dd4ce76a3bfa255 SHA-256: 36b52a99f8018c0d9522ce4bbaba3414ced1e770c427f52f5f519d114c5cbb16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sp3siemianowice.pl/userFiles/files/44308116699.pdf In PDF document text
    • https://deltaguvenlik.net/userfiles/file/rujexusafuzibawiviwisato.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c404dc25ea2---93724769856.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xewujilogibapule.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084446798e0e---43767794962.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/87142035222.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1cf27fb2a1b7870cfe5ce87191d012b1/46830447048.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/77777406215.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aa1fb54ba96115010dc257316284b88/lovovotejasabiponir.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711aacace39---tovasukakedisiniw.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pexizikix.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df00b4956b9---77237741221.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/jinotoretobiwupokaxu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/labafo.pdfIn PDF document text
    • http://tyextractor.com/d/files/jozalelivoladat.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210726005127_cxarks.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/sibemuramamaguwose.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lutinitatiri.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1f16ecc1608c2f4df74cab830442bc64/minubegunepuvonafipovi.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/42270278092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ts+panchayati+raj+system+in+telugu+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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 18344 bytes
SHA-256: 007d3ab2afa1fdc027cba0186557220ad80a1e1cf693ebda1cb27e45ea44e121
font_01_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 11252 bytes
SHA-256: 639f12df439fc7965d005b58f15a2a991a64bc4b2dfcff348967f9c87bad5478
font_02_sfnt_off0001347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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