Malicious PDF — malware analysis report

Static analysis result for SHA-256 99169fece678c697…

MALICIOUS

PDF

88.3 KB Created: 2021-09-15 22:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4df657e06c7146c99d38d23d9d16ce5d SHA-1: bca0d6fa4e671069c5b44ac96fe4894de2769d52 SHA-256: 99169fece678c69745f0b37eaef6481307bab4075a27eb7b7f8daf7fa675f087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://mobitransjogja.com/files/62505408700.pdf In PDF document text
    • http://eatatrudy.com/uploads/files/90947788655.pdfIn PDF document text
    • http://santeh.md/img/files/ruvatuwerofitugobogapufi.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/80257388643.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/97616327602.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139215f87040---70700395557.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s6d20lo4pa7596l3cnrt65tu30/40228464155.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/459869257.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jetewonediwawojutazu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kadivokosu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1539046143613d58f8a1553.pdfIn PDF document text
    • https://masukpt2.com/contents/files/nipuxudumoluvutekujaza.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83263303470.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905080017110558.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/jujuxogosijitiwoziforisid.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sekirede.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/75401557935.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/15413357669.pdfIn PDF document text
    • http://congluc.com/upload/files/36434351772.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/fubewuru.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/4810819449.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/lakorenuxa.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5edc0851f4775a18e9ec2aafefea8676/jowaseranevofok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fast+times+at+ridgemont+high+putlockerPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/82869342477.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 11132 bytes
SHA-256: b16e072a4a3a0893cf53a871e857b0e3350dfb7b863ae9b047a66eb2245d2645
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 20724 bytes
SHA-256: 5d140f0cb7a5eac42d71b37b1725571b7231cb4470c407bbb5818c81284dae73

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