Malicious PDF — malware analysis report

Static analysis result for SHA-256 a607d9fd0dce9e3c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 21:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b0b97b117288117c4c3201f269ede96 SHA-1: cd9fa9fcda6d23409e15e833a9df879fb666b6da SHA-256: a607d9fd0dce9e3ce68c2dcbe36a66a4c4f36ae9a652e76d0fd138120c2014fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be phishing or malware distribution via these redirects, leveraging the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=redmi+note+9+pro+max+update+android+11 PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a98e99c2393f58efc68d6f16cbbe9160/ridawagufuborub.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe8762b48---zixebefivuvogizitojuv.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/kowazaxikavepunewaxuwi.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/31254359701.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405dfcd23da---93490228531.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/98858213126.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v2a2m0ord3hkbi0ui4bcos5v19/xudemiwanale.pdfIn PDF document text
    • https://tdfstore.it/file/2215119267.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/91641552489.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/fupunisewekip.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147bffed3cf3---24230147254.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/30372107933.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/somukuwibi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/97298480353.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/padaroxinu.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zewipatasivojusajuzav.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/53409995605.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/37631366254.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/75169787330.pdfIn PDF document text
    • http://gardatrans.com/content/Files/95474354645.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/naxodoti.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2c2603dd84bc5cfc1a6b46b82eab762d/77178346907.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_off0000c48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 17072 bytes
SHA-256: ecbe1325226671ec6458163994d01902ea51910f30ae8a2cc4cff647cd2fbf3d
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10804 bytes
SHA-256: 397cb9cb84a35a323127495085ee445fbbc06052fcf1c9f1f47898538f110460
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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