Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6ff34b92f0ada…

MALICIOUS

PDF

86.0 KB Created: 2021-07-26 15:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 088e9eb184fff5dab5417a5be8f80679 SHA-1: 2b339bec468caaea283b8a7c05b5b19a375ee4b5 SHA-256: aaf6ff34b92f0ada6fe6d6af87866741d9102920d0746c761b19e20c45e9db51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic firings indicate that the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://docando.es/js/ckfinder/userfiles/files/koxafo.pdf In PDF document text
    • http://immopolignano.lu/images/maxofezivowekoxiduligosa.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/tipefa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5222883---79844514757.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/adbeb424b66a5b1fcc266b10f43e9271/86983704472.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/abe037dff5723533178e58beb6ed2ae9/zexoboniwe.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/buxujixidelarezike.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607750b9518cb---48959375567.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2b8df5ced86c3802ce4360d48d89f2e9/bosekiparedimugadiru.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/puxevamoluzumafezipotudig.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2bus78r4ur0a4eoiuvblc3s7o2/wizuwewuxibonebasa.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bbf5124d3---49591626849.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94e4ca368---6899762594.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/robutafolurinuwemet.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-13/20210613153335891775.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/sovedesan.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/21245907982.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210622224544.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kogumelafejimi.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/69912547437.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/34db04f9687b4356c4d552683254fc8b/74549362557.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/44085194488.pdfIn PDF document text
    • http://leton.pl/userfiles/file/filadudunewen.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/13762411207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=geometry+dash+2.2+download+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3369df96fe7b198b7c88ca448f7a3012/nirufa.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 17620 bytes
SHA-256: cc0e10cbbd9f29e05783469693c1d2fa36717a78861ac316e260c5ee223cdb5d
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10936 bytes
SHA-256: 5df40ee309fc64f470a9cafd4aa627bddf2aa2ac552312eb5e9ac90354aefa8a
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16448 bytes
SHA-256: ba8a54975fa7a6ab83a702289b136323def37ed0a338f09a6418e6bb0b43f61a
font_03_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1