Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d39a8b4923798b3…

MALICIOUS

PDF

87.8 KB Created: 2021-08-24 23:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3a589e8f1eb860ab53cfb7d7efe17dc4 SHA-1: 36afb3309bd6a91e0a1c561731d66bbc86259a05 SHA-256: 6d39a8b4923798b3e4074085a7a097ecfcf03d36f8aedf42f7a05092321d9681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=stative+verbs+explanation PDF link annotation
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f3c1627de455d98ec624e29d92944352/talabofisebexak.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d71c105e---giwomovuzurakomowizebit.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/suzijagafezitepad.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3fred5hrke2flbsu1chlo7958m/vatobibuvologi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/129otoigona19qahs0c2jtf786/39235034212.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/11458705552.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/9tdil2pkvheit8gq1betqe6bgf/58449240163.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/86030622733.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/95664440798.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sepewulaler.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc87abba3---zasolosiko.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd7ce9459a429fc3e5d3f1fd2ecb2355/29835924244.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f102497570a---52392172073.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bb1c289b0---fanigapewazanakiveji.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c683e48098f---litikavanipaza.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/bisazovikefab.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6a289ac4---molawonafejumenupuz.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/30461190100.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd1e78f553---xarubiluwejofozimil.pdfIn PDF document text
    • http://e-hematologica.com/users//file/14784140064.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/redudupoxaxo.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/defub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 18404 bytes
SHA-256: 3bc404245803522524cac1768a0fd4376980cb9881ce76ec161d77e0af8e968f
font_01_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 10628 bytes
SHA-256: b46f466437d3d2e1cd59be26a04dc5a40ba58d445b0ce1d8e201f2f41dbeac7b
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off00013819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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