Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb0d636aac68b9a…

MALICIOUS

PDF

76.9 KB Created: 2021-08-17 20:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c0166d03642c97ad786e3c6991e2b5cb SHA-1: 72f8bf9cbcafefe302b25e09d7d43872df24a83f SHA-256: 4fb0d636aac68b9a2709e675f18eb919cbea48b2b91b49ae4c5eeb1352032b2c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sethhukumchandschool.com/userfiles/file/dajekinibogaka.pdf In PDF document text
    • http://yuc-fac.com/uploadfiles/20210719153756.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lemojunugelumitid.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/48fb3bceed7373fa7668c6b21e54efcd/99635630163.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/97740154108.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xesena.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160948dfe04e27---sisusatofinemipowodivas.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/sisaxoguzupuvotovogux.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rifedesuladasikoxopijikow.pdfIn PDF document text
    • http://www.bandungmesin.com/file/77813957053.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/59035729921.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gufifodexadejonakole.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9m9o3pluemcnbpqr748ld1le2l/88817623196.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mimagekikexovuwa.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/99795923960.pdfIn PDF document text
    • http://terminsk.by/pics/files/suzeduzekoteraxow.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/954o5pei79a0rjiisllhtk0s54/tasalofozunanoselaxoba.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/pirijoxubi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/ruxatepuwowoduw.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wixasozajibalinalaruwap.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/guwirunu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/linopogemunitav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tamil+kuthu+songs+download+in+zip+filePDF 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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 11144 bytes
SHA-256: c34a03b2f40654604e618a4e64efa1eaf0c66d305c59cd450e1a07d9c12199fc
font_01_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 17152 bytes
SHA-256: 98d736dbd8a26de501612f0c18291ce7761413154ec7b9765d9a80dcc72df38c
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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