Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a769e05a1be809f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 23:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4e29687ddb64eec79ce0df49ad2931c SHA-1: a4605febe10f7b3d868373861d1e723eca402bcb SHA-256: 0a769e05a1be809fe685f099a7b7aea1f27b1f15801fcd305818148925defa6f
176 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a strategy to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=bot+do+sfgame+na+androida PDF link annotation
    • https://rumputhijau.com/contents/files/22615004461.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/63294077776.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210911185710.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dfb329ca---78419911243.pdfIn PDF document text
    • http://clingac.com/d/files/dudiledetono.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb60b1bc---zukadiwonufejevimug.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/bekugemebofoj.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/93119009264.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/rifokedufilugod.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/11889742871.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901092731.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zotidup.pdfIn PDF document text
    • http://computerdoki.hu/user/file/roredusigudunu.pdfIn PDF document text
    • http://gibisch.org/files/files/sisibomamalagesigenivokis.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82698004158.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/wunika.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/88862969515.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/savajokekawepebosa.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lilibut.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/42617090884.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/14244090618.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/533765eb546969b5358ec08db49bcd54/zinosorajaralopugunobu.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10704 bytes
SHA-256: ab3fcab20537f9ddc9a4c4cdd4efaba09e5c15c82103b624975a2a63f8018e21
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 20224 bytes
SHA-256: 67b3f6e043b05be1bc78d77966e1ddbe7e518c2a5d8ca378bc280ffc5afb57e2
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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