Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb86cf03c4db9073…

MALICIOUS

PDF

81.7 KB Created: 2021-08-30 03:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f6db1abd010b08de0f006c68cd37b86 SHA-1: 0a51422276a3c7a2616cd5fc4056fa2902bc1e86 SHA-256: bb86cf03c4db9073912ecb281b770715f8356bcd6dd060a68875bbef4522ccd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mxagproducts.com/upload/browse/file/xezujoguxaderopeti.pdf In PDF document text
    • http://labonscafe.com/userfiles/84353025500.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/32933610204.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/62825665317.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/12895782977.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/gosatekadisuledimexasone.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/53042978521.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mojave.pdfIn PDF document text
    • http://ned.ru/uploads/files/55761619491.pdfIn PDF document text
    • http://yuha.be/_files/file/vuxoxunopef.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gukigegalajagodom.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fe490020791099b6151df17d3c521351/duluwo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16228918729868.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/soketopurir.pdfIn PDF document text
    • https://cityface.cz/res/file/92958841172.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/mabilifuwege.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/wemisajedafarefixumi.pdfIn PDF document text
    • http://mosjob.ru/images/file/40177186522.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e7f6c2316---ponob.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tasenotoge.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/rezaxanezogovef.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/77347071058.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540a8767da---8772838593.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dca2d05a---mugikokatol.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc867bc9d5---70751518972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tide+times+ainsdalePDF 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://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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10152 bytes
SHA-256: 27298dd45f32d17732d2ecd9e333a096a817e553a8ad9de850aca8cfc497cdbe
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 17284 bytes
SHA-256: c07be3884ccb8472933180a5db370bfb5ec3d7473a9a2a2346df045e79af4057