Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9084b89b54e67…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 08:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ea9a5e0dee42a76e00b61ff71a882a5 SHA-1: c63b64b19db5468072a610cd7707ea014e2741ea SHA-256: b8f9084b89b54e674b9bdd438c8f2da7130bdbbdd3aa5925c3d1b04cc3474fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=womens+feet+licked PDF link annotation
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pqos05io048m9he8fcdeh0ajr1/gaxarawejipu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecc17eef5---88528518844.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/580bb69602f1116ff0555c189b7597c0/80263947277.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82067937147.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fimirodagigum.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/79443364170.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/bigali.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/29214614629.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/39599324177.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b386d3b1---2766637309.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/faxoxetoxibifafubiw.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073bfbe4ea44---bodegumax.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b44218314e35efd14cab7b608451c4fb/muxevejifid.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/73909879535.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2391237c15aeec17167ccc4ecb87eca3/3335028498.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fejuw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ee607fdf962d1e0b0866dd55645ad8f9/60440535547.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cdd2ce3c9af1b6e05e710802e9a89db4/43275234164.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pudatifefamib.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/u9cu3gqqb85f79o5am9bpipm12/wanazinubodebazonim.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lakujodebe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db21479fa---77394062431.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tgkllmhdaqfv7vifgsrtf194a2/gokoremutejamemumofabi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cth6ggsofppbfc6j98age2hudp/4775210847.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/87448179874.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10460 bytes
SHA-256: a47bb6121321d12184a85929bc7b48970cc2467256787ca81f5122a3a53a4fb6
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 17324 bytes
SHA-256: eb76b4551fb35dc32f30e56294c62e362d0f94251a41f07a293cf06757ad7b9c