Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61bcab2a2c96e77…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3cdc40855c8b2631cf0ad22f4f72a48 SHA-1: 5a4432374ded8674528cfe611f3fb23b15b94c8f SHA-256: e61bcab2a2c96e77f382a807becbb5d9c3f6dd075df55847ba4fe0ef35acaedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and embedded content indicate it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=how+many+minutes+to+cook+chicken+breast+on+stove
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3878e5ad8---98374952408.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fdc7f363---gojirexoxevenapasubewow.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1329016bc---56350294678.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836e81b2f01---54227129370.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2c06f372348d62afe873f3ed9ff52dfc/vanafekokoxapawodix.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7e780d0bffe362fa739b6e57873a3f97/8606264890.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/85nfmiar0h1acuiiu9kghtbug4/78366629546.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/jajasividenoxi.pdf
    • http://hugslock.com/app/webroot/img/files/gixodedeguledajebanab.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2bf9d7a9da7b68068fa7f932b9098de5/28081250968.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/13d90d3f7310e79d28af8562ae1a52fe/39780527960.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d47280a197d21e400f83e61dcdc3764/luwujix.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899a538db63---86840262965.pdf
    • http://jfac.kr/ckfinder/userfiles/files/519133758.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0rkqb7a9s5s465p62glff6253e/58625090133.pdf
    • http://cdkkck.com/uploadfile/file/20210620171739.pdf
    • http://softwarefactory.nl/images/file/91923053491.pdf
    • http://artkulinaria.pl/sites/default/files/file/29529873150.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/801cb8823d869af9a4ba855bf007e9c4/99199933074.pdf
    • http://vmkmsz.hu/userfiles/file/vimimugopetigubaragajo.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856602bcc3---towudubekajim.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be59098519---88552583141.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
font_01_sfnt_off000109ea.bin
c4fca93e00e84a954aa1a971416b05ef698e76d13e55856f8021766da26bca23
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16804 bytes
font_02_sfnt_off00013555.bin
e1341fa264c4ff555399ff2d28149d6cc9b68dd48d14f495475c1faa9dc33926
pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 11040 bytes