Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4560fc6c4d7595d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 01:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2769d3e752a637b76171a939035c00eb SHA-1: bbe04622b3d5f4f64eefa1cf1a7c6edd49f0f077 SHA-256: c4560fc6c4d7595d795bab0b4ebfb2e66cbaf0b6268db5c52927cfdfe4089365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=classical+music+with+harp PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc297f4d49216f5005295b9e465f5022/63920125891.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8vddfau4efaavjcmki3jkoafch/xozezetatove.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/7873945836.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/79801907458.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mf4nooqdp0946de8c2fek9u6hi/fasuzisilasuru.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-5/20210705153329311619.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607174f246aae---89787629318.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703491b21ad---62221738122.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74487ace5---54238621063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53295c0a41---bixosulaman.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vnbg5093pfmc1jaefisv4gi7m7/tilukepefezib.pdfIn PDF document text
    • http://stevis.cz/files/file/22512207789.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/99511624306.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/vojefizepabimop.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ba6587ae79772be1bcae99655ef93f98/87822609327.pdfIn PDF document text
    • https://limmaginebistrot.com/file/82092164621.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/55919610646.pdfIn PDF document text
    • http://apvn.info/userfiles/file/99179864785.pdfIn PDF document text
    • http://olympusflights.com/files/files/19294443073.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/lerowibakonona.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f854601f---34465074712.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/10125217677.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/88a8fc8845c78f38789ddf36cd043d4a/panopapib.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/61600601514.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/13649064123.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16652 bytes
SHA-256: 94789bfdd4f47eed07f4f3f107b29ea1fb507075444c700ace5e81230aff8142
font_01_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 10500 bytes
SHA-256: 533b448af0c5c7e340b9e490270ded3787f29305c5f4e8d5cb25ecaea6ea3c7b

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