Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1a018fa720959…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 05:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e8a0d3a7d99e2f0988edce74548b294 SHA-1: 6a03ccd3dc3b5870af7eb4c1045c4687e2f47e21 SHA-256: f3b1a018fa720959cee0944a4694062a10bc127de52c5cc3d9c053657bcc933a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oodow.cn/upload/file/21090509133138355758gmnjxwpbbv.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cbb5905ac---67603468630.pdfIn PDF document text
    • http://szpk.hu/_user/file/29801533880.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/bozove.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/39531677822.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/53783119949.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ecb79d329a0c01b9a95d8e2fd96d38b7/jorajifuj.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/4480189698.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/lenizoli.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc195a1757---volelufunaxuxiro.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/daregekuzaxa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b80100a02---nelipalakivavisiw.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/lexatoxewe.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1d293d147f50234a2164cbbf3e433e91/58899031027.pdfIn PDF document text
    • http://esteel.my/userfiles/file/41629265389.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/14313446213.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210904125738_cyp1xg.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_181203.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/99142349001.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/84939092161.pdfIn PDF document text
    • http://o-dance.com/upload/files/zijuwofoxapevukuteja.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/15881383504.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/26587163548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+hack+ios+no+jailbreakPDF 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_off0000bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 16928 bytes
SHA-256: 467824cf1bd828f59519b8e4b5208d39fc07f8d690b87d619f2ac30b99c60cfb
font_02_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10944 bytes
SHA-256: e4dfb720b8d34bb7ca905b6de8fdf8661c52ed26f4a7ce8d715650c508b6440b

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