Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb159feefd67003…

MALICIOUS

PDF

99.1 KB Created: 2021-09-06 04:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75d08a6724977739d2e4e067c24c6292 SHA-1: 7f06f53aa55c195cf9eac6af5336cc91efe8d905 SHA-256: cbb159feefd67003b2a98b05f5a9f26608ffd77a331f7ff96b2a978a6329fcb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content, potentially leveraging a compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=daniel+libeskind+jewish+museum+pdf PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b7f2d57a---pebiro.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/pazuvis.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/97dcdfa93cd3583fe781bc95268e2e93/14982343990.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/49065469821.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/madixigononor.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d28b5224---88821778495.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/11449973465.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wegiwitigimuderovep.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/dejajofawevomanaxu.pdfIn PDF document text
    • http://allycatering.com/userfiles/melubalinipovowi.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/kebazadu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80b79889---weduzujoxe.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pnh1p0d4euikc8s7ppdbgfv0l3/25414692110.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11798178329.pdfIn PDF document text
    • http://euro-ex.com/15998625612.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/92a7807ac5a6a71e5451b5293b251e2f/gofilizanemu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pagepunaroluju.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6509aaf716a1d8eccb17c712310e1557/26947404483.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4bb73a57e41db2f2118f8c65acb239ba/87391061729.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160897fe61fcf8---34954528680.pdfIn PDF document text
    • http://www.pilartangguh.com/file/wedinamaduvokiwopavixik.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/21171413981.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6hep04lifpb0k1kdsga83buk9t/90048334660.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/somuzojek.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/472a314d49eac27ef1540da48d89a789/rutolizok.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_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 20436 bytes
SHA-256: 9f8a6b52249b7c819392406ef9fee03f48f1a78abbe763c586cd9acc6f439542
font_01_sfnt_off00014d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 10992 bytes
SHA-256: 4108e2710c44172d772ea56997bc44dab3ebf0b47e9dff9225eb6c6459fd6fb8
font_02_sfnt_off00016636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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