Malicious PDF — malware analysis report

Static analysis result for SHA-256 837a31142bb473b4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53d839837e3a83d8b96f693eaa9c39f0 SHA-1: 7e66b290901c0d72b72856905c4c25d93e010b12 SHA-256: 837a31142bb473b40633b421b88b65468d7515cc541f77bd54df311f43950219
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://futureinfashion.com/ckfinder/userfiles/files/88971888422.pdf In PDF document text
    • http://rcp-ranstadt.us/files/63197187464.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a65439b97b08cd00ed67a186339cc961/43181646257.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95a648be6---pumunideguwutu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/35782069095.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/96166525177.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc15646ff54a71bb645486a72fb305fe/76678240811.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/73fef0a7d4363de60dd05eead8af42c8/40987739554.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/vabogomolofotetimepuk.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9193ab8716526c903b7e7c56703fbae8/favemugafitibefi.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/25545332401.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4f458a6756bbc1c2219a01c3749b18ce/40181632827.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/zaduxat.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fuliraleliku.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/juwusifuf.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d53b525f967---3727377109.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43a9c131f5---83424238592.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/057d4b3c7d54765ac29e3ac05710c59f/10397660247.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gc77nqj8f8mhnhduh19t3eldh5/kibezazizilizuzolaju.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c425463e9a4---63993089600.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/zofesega.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607208aac1e5e---taguvinonetowo.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/91849585771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+chronicles+of+narnia+the+magician%27s+nephew+pdfPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 17076 bytes
SHA-256: 600acdb40f087f50f822cc04fcf4b213b10c0ad4c15e146c478d79cd6444437a
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 11148 bytes
SHA-256: 31451570fa4cad01df61ec0856bad43b0fecaf6d21f6e69c717874309a3bdf54

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