Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77a8e4bd6adcf44…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 05:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1d3cd457af3433f0f288e3bb1606544 SHA-1: 7f1569bc2048131c459a4320b68f65227249f3b8 SHA-256: d77a8e4bd6adcf441dfe21ee669a7c929debe1e582defad8af9d47498a353919
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56975a93231771f6964b2d62e0a4a8ec/jejosafokotej.pdf In PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/melezep.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/32401003701.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175be8f754---jokororamuju.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/976de65df430a8df53024172b9d5b765/99285310175.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/ninowasekuv.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/80917079505.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/benipowipubovufez.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ef26895cb8f02989d930365ffd76c3da/ferejifoxa.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/ziget.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b887abf45b---selemupetorukabuluwib.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/musegaz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ba6c3b61b690b58711ae7095759e60f8/nagofukobupogupexepamib.pdfIn PDF document text
    • https://aicsmindia.org/ckfinder/userfiles/files/niwibakuxew.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/raxexeximuj.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/renob.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a569ab14be---gepidojuf.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1gcqcis13ts08d85v0opgogg8u/16201958670.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/23101778559.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/40888719019.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/najar.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b0e2235b---96850548936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=practical+english+usage+by+michael+swan+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_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 18380 bytes
SHA-256: 014b0686681f4ab531b59ca610dd3e67f6258c9524729435abefbc9b11bad561
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 11388 bytes
SHA-256: 4631061af121da80e9def6fa7d144842a32f10bdc63116d2ae17c7b0ff62f4b3
font_02_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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