Malicious PDF — malware analysis report

Static analysis result for SHA-256 042f8e3395d78168…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 22:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5abc3a41ef5379ed6cf56db1db07541f SHA-1: 383acd72a9cfa59599e6223ee3d0304668c66bc2 SHA-256: 042f8e3395d78168f7a06e9606206a780f70abd6135976cd5b88a926b3631994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=variabilidad+humana+en+las+organizaciones+pdf', are likely used to redirect users to phishing or malware hosting sites. The PDF structure and URL patterns suggest a phishing attempt disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=variabilidad+humana+en+las+organizaciones+pdf PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5bb3f7b6---wemodulinujo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3450654379.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34106b1554---gidinidesefijuzufinelef.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zutanuzevivibakimaludokat.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/lelozulukexufomirawokev.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65df630b8---62281961091.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611321a06d94c---63204921326.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/892k61pciojbmrsffqrq1041qj/sulipefopiwobuvo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0fcedfb2f---tilidonenizevotelin.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f74a1c6ea---zejetal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe3f06dc1---vuzugejunoworu.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/33223776946.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/61823512022.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e215b03fd---81531431933.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/dopozerikivujakupokegugi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/xofufe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1e92f7b94d81021a1dfda5e518c90ea4/59325408997.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/9797273242.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/tunawisedaki.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/dosapiperilem.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b0dd37a027f1c85f6e87d0f7b4be35e9/zuped.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tq4mg1np5j1ko4j7ote0pbk28o/sejefasiparuramer.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_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 19532 bytes
SHA-256: 41d3cc63c94be5feac35760a406ca741b3df671848d467756881a649935beda2
font_02_sfnt_off00015982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15982 11236 bytes
SHA-256: d485d289bac49d686bd2f414a7b72dc8d526324f9bab8e71a410fa9e2e36edb5

Open this report in the interactive analyzer, or submit your own file for analysis.