Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e03a3d6b9e0441…

MALICIOUS

PDF

120.6 KB Created: 2021-07-02 10:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 169b7934616937da94af877534be56a4 SHA-1: 9749505128edc8807ab7908e3de5804d0c463d55 SHA-256: 26e03a3d6b9e04418216f0053e1c05e74912b9e8bd149be7a243241c51c6bfee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this, as they likely serve as the final destination for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ebeb8b58c6993356265b46b4000dbe8/zuvewiri.pdf In PDF document text
    • https://sardavetri.it/userfiles/file/roduvezuvufepozalafidunib.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6ca091d6ee46aabe5f4a8f68f8afdf0a/59774408391.pdfIn PDF document text
    • http://ned.ru/uploads/files/xekula.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/46873060391.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2sane53r14762086jm98dovgk2/49298403432.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc95df74fcb---lapeketavigudofin.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3bbf50bc7---bofetasojin.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cmscud100holnc3s56ige4iui9/44225881423.pdfIn PDF document text
    • https://777mto.com/contents//files/84480394962.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/felinuxowire.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ok4ttlu9lsj4h97dc09om2imd3/milefiburob.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xefajo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6eb49b1373c15b49ce95931378afeee3/136606116.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4db3cd664007892f77b9000b46441f44/rusim.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/55757521801.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fee6b902c2bf101902df6c2d209e65e8/97159424277.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/20bf65149aa56a6aa946a0efe635adb0/96046032892.pdfIn PDF document text
    • https://estoniapools.com/contents//files/96654263236.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/63043cb9149a5529219439836a9a0547/wubow.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72101507941.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/76647811106.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/81392092349.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuwovakezadewimefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ambassade+france+cairePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000164ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x164EE 21344 bytes
SHA-256: 88a06e0eab4685d383ea197d5d0bd038eaa53cfb4a5a71b16e74f60d5c061e1d
font_00_sfnt_off00014cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001899f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899F 10496 bytes
SHA-256: ce6241006a183d29c87537d0afe94423c871a81482d57dc123d591995cf1c2fc
font_03_sfnt_off0001a173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A173 19476 bytes
SHA-256: c3875531885a8ae2aeab2f25d16e8ef0006f0894be059b4dfba97bc2e5ff46c7

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