Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ec00a2f6af87ca…

MALICIOUS

PDF

83.9 KB Created: 2021-08-18 17:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 45797d6234c13c39d26b891db9a4a2e3 SHA-1: a38ae0b19f6a67e9ea0baa1d0c1359214de1436f SHA-256: 59ec00a2f6af87cabbc36720cd1e8b58219f17bdba5203b19d7d9419c762a0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is heavily obfuscated, and no scripts were directly extracted, but the presence of numerous external links indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/orb3njatt1avoplctc8p212ok5/63088001332.pdf In PDF document text
    • http://jiin-torng.com/uploadfiles/20210719135711.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/70938684945.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6717a00cf---68700758235.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dae15042---1446163465.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/12408080951.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/nowib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/oe57jd7061sf4qbtpbrsr283u5/44830659022.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/jekaxepolapuw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c0b8329f301b7a28195721917e9fad27/17704331637.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/makufivorinik.pdfIn PDF document text
    • https://kueapem.com/contents//files/siluxiwuvumubisuvisogatil.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/23101778559.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee18e1e2c3621be6e88f341ec5802db4/pirovimavamutukigiw.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/waludafata.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ziviguvivebatijuvomixosi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e9e5820d0342430d54ae9abc1e28a12/110160804.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kubuw.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/39062559220.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/zapoxuwalixof.pdfIn PDF document text
    • http://www.toptehnik.si/images/14439083028.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/80380978635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sample+diet+plan+for+gastritisPDF 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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10916 bytes
SHA-256: b3f4789c44b678baf5add9e2451fd2c5dbf799a81acb5e1390d43c7b08a28df4
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 16372 bytes
SHA-256: 03e3e46eeaee67e8d76108c04fab8c6ecfbeac747ef855858312104400ed1896

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