Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb664e3e0533b85…

MALICIOUS

PDF

74.1 KB Created: 2021-08-27 12:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c49e4b99403b520cb2e92f473fd736da SHA-1: 17fc12ce2d0572efc19cad693ea3df7bc3cf2fc5 SHA-256: 2eb664e3e0533b850e485895199f4c6253d22c58e336842af39f59e5e9ca61c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=digital+logic+and+computer+design+by+morris+mano+solution+manual PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7669c576b73af67a2dc370ca88268899/nukideketoruxumumifukimeg.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/kajetejomaj.pdfIn PDF document text
    • https://ebooksweb.net/files/file/neluzufigotazizuladepob.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9114773920de5fd11382015b166603c4/70634216290.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/98837166473.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27805903269.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1797ad996---49713755053.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/96495556298.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c1a875a4---zepipabidifagum.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2be41a95ea97398db4603650c0b79eb7/sexapovasofujuxipojepemit.pdfIn PDF document text
    • http://poiskvod.ru/images/file/gebatufaputelaro.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b817a6b534---3595210894.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/44938806083.pdfIn PDF document text
    • http://citra.cl/userfiles/file/80764794954.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/vajopuvovogilufepidekogok.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/wetidageduxo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tanusul.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b7596a5b---22960323743.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/mupefikekezomidin.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/41616907093.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/46780809384.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pemubal.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/80980778009.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/15372962289.pdfIn PDF document text
    • 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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 15640 bytes
SHA-256: 98fe57ec69741f229ac660519e3fbdfce036f9e703d69e37ca0c4e0afc20abd3
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 11212 bytes
SHA-256: 85692190efd9bdf74e36fd9101454319275b7aa3591a8536fb8dbb064079053e
font_02_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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