Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3429d637c3704…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 16:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 834627d6a0ed729ccd32c221328b618d SHA-1: f96718da915f462404e8496cd3bfed0477b5e579 SHA-256: f1c3429d637c3704d1b76ee7c142d69e6d32dc084c78ed24a602afabc1b84757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e45f9336f---28808403786.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16103d4688abdc---rawusakaruzuwomagizubir.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621994879.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/boxen.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8337cb914---97784015079.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af9c69089---dolitupumalezaboromido.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/samonevejorowed.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/36162697796.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ca2f52722c522d0c25fcf3b49daa5dd7/teturiwumokam.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/75d6eb89ebcf8b18ef54c0667fc83349/mopezatinekub.pdfIn PDF document text
    • https://asiabiru.com/contents//files/36259445035.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9cbb35cce0839a363cb126e0e4071d92/98177463803.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4e78ee56---pudegodojejoda.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f2a1053f---nimebe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/natusolubum.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/84887284331.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0015076a3822745de40fc12440749885/kiworidan.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077287116df6---95358284343.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/riwujixejov.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/tarinamanuxop.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6d836e4887cb37aa9beaaa1722af5337/wutoz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16076777174fa9---42690631726.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3650408168---8774365185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=resumo+livro+entendes+o+que+l%C3%AAsPDF link annotation
    • 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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 19196 bytes
SHA-256: cc6b3a690f5d050ef9e0d40a17d6d3b7017391643e88e2aa2cb7f35f8c9c48d2
font_01_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 10764 bytes
SHA-256: a8502817d3d7c362688d8ebc8a77535bb99819ddbc31a1c8ba5929828a084092

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