Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13b600835f9a05d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 19:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e40bd1e474a964b92a27ded539e2998 SHA-1: fe323d6b94f74949970f77c0d0ea4684bae32d72 SHA-256: d13b600835f9a05dcfac3c5a3457f6beda6487d199630897586693eb8b9235c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, indicates a likely attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=present+perfect+continuous+and+present+perfect+exercises+pdf PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864cbc9783d---27180124171.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ce35a02b64252668bc83254cb124377d/12604366389.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f800873581---vudedowizokat.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/81375556920.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/67594966073.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/dd5cf1de03b4388784366a828d9645c5/56861991184.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f546e1e9---lujadagisukamekiw.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/14041879630.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9156f93f9d---72437258550.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vimevene.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/44968c2caa24cd6c7a2dab6ffac44af2/54713225081.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515080830_lgkj6d.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/loded.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f5639aab1a87bad8d0e0853af999e8b9/tikuminuwonu.pdfIn PDF document text
    • http://fteq.ru/files/file/javesubafuga.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ls2u86rup8qt2pu4oq8a2neo70/lonimox.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e02c163d34eaba60633ae65c324397e5/316058611.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/13075882986.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93cehinjj3e05actj2mvoh4jui/xelin.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/42801277491.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/viweziwapunuwerofolero.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/tujuripuporesodoxakari.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 10768 bytes
SHA-256: 95c8639efdbd296b8193b990476ab532deae07b5015a128766f67c0e5bad0562
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17816 bytes
SHA-256: b750162f214ee23e4783a405e299ed52301371fc4595f058b29188336ab029fb
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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