Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1949d7a02b3f00…

MALICIOUS

PDF

75.4 KB Created: 2021-08-27 23:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1fe3fab22ad3873bd04f89c3ce31716 SHA-1: 4996568d650be814ba252f26ab2ef37ad78d3e04 SHA-256: 5e1949d7a02b3f006b9ca5796dd998c0e31dbd9d1f49716872e556014a7b9edc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://sonntag-immobilien.lu/userfiles/files/zovaduk.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210706_A9B86D40A97D88DD.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a382beb65---93952804872.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c431b09b---41004553425.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/71393965969.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/bikoxotum.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/wevujugexej.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/16886047934.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/36783632908.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/52248811664.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/55eb410dihvm15l742tb88qs8m/83443806727.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/vijutomapogedolidibezil.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/82102492913.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fobnpajgea2nhkh37rn84hjtb5/situbakadofaderej.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/50926342238.pdfIn PDF document text
    • https://jensbrode.de/files/file/setipulej.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/viledotodosedopidamaje.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/86a9520b5de55ed76b1f64e8c62bbb13/webisujibozefapiselija.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c9ce70fb---43023394189.pdfIn PDF document text
    • http://jngf.cn/files/file/taxobavazuwoxabinapuxiji.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3917a20e4---zefotewufebalaw.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/5962313182.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e4315ed---99976770528.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99127534503.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jamukirikotujat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=northeastern+tuition+and+feesPDF 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_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 17172 bytes
SHA-256: 3365945409a505f94c06c7c02a684f4135053b5dbb89bc51ca5d25f239c606c5
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 10480 bytes
SHA-256: ff7c3494fede3ea864661524ffd18817f11badeb1c4a2d20292dd985d0860bef
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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