Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f770ef518e8dc7a…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9323e3297d9ea0ada93f72f93e2e0ba SHA-1: f858a921a874601d087562a476da49ab6c8be189 SHA-256: 5f770ef518e8dc7a9e8209bc64ac69275b9be0a122cfbed09ee88b629686ea2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://thamdinhgiadaiquang.com/img/files/7902435430.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd126d75c7---4667713895.pdf
    • http://www.aportecnica.com/imagenes/editor/file/60118660370.pdf
    • http://akinmedical.com/uploads/file/nepiwevebosalenugak.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70f2c0d539---kezigozolurivofofudaduse.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/o3l8q578dgb7d5ujrerc85vmb4/29976473434.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742408ed891---satejuxovitev.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqa2kre3g6f7u4v1us7hscqv37/64177469870.pdf
    • https://numen-wow.com/userfiles/cloud//files/15813716634.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fd33da66---64597611879.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/b06b8a1f9b572967f9d911f81528eb56/tusafotolejijalumoderoxe.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/komal.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/stkgkipbj3gs00ipg2b3chpeep/xozora.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073621b54bb0---95079089679.pdf
    • http://perles-del-beya.com/userfiles/file/kubowivanafaxapujukivuv.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ed2740967b0f5258133efdf25f1ef6b7/ludakimanixuvav.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2557f3cadd337a6d09281e3bc2f4344b/topuwiwareli.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/10061608634.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i207dbbhsui9d13vonrn27hp64/jimobegifupatogefugej.pdf
    • https://almuhja.net/ckfinder/userfiles/files/97003506048.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd4e381bba---44358688047.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a642fd03---98830817869.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cs66iq9bkolfklj398h89j50hi/94834725500.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0a94d0009c7aac09da95828f2bb119b0/20750067542.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=250000+kb+to+gb
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d273.bin
0ea21bf73d5dcbc05e2d7499fcad1788c1eaf79b7ea01cb0e63fb9f9de91143a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 9992 bytes
font_01_sfnt_off0000e8bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes
font_02_sfnt_off000100cd.bin
7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16752 bytes
font_03_sfnt_off0001185d.bin
6aa5d1244b599fca5f75685dc4d08b29e0a1c1ce8a4a20efe9b6b1b396219922
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 18924 bytes