Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd1d35b2b945e92…

MALICIOUS

PDF

97.1 KB Created: 2021-10-08 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9a4d449ec5193f57eb264d1e87e4987 SHA-1: 38c785055147587e89e3dd921da581a7a73cad71 SHA-256: 3dd1d35b2b945e925615ab2aa907bf5a14871324d13d5cd73414eb0e1c4836bf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aftp.bg/userfiles/file/78460769406.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07857631557074ad5f79b18f529e0315/gutenanuwitumu.pdfIn PDF document text
    • https://ysh.my/userfiles/file/nenubegegazodexupunefidex.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c5122a36ac---85928543218.pdfIn PDF document text
    • http://climtech.com/files/files/81035431468.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/19533924828.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/80202337924.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/bonekuz.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/46863055984.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/nupabaduzupejazaro.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/migitolo.pdfIn PDF document text
    • http://juentai.com/userfiles/files/33247751253.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/61976938814.pdfIn PDF document text
    • http://exosushi.com/uploads/files/jaxup.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/66919393273.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/99363087175.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/31145440303.pdfIn PDF document text
    • https://grouptm2.com/contents/files/vizakisenemix.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/15161684739.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/99562114031.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jimadugo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615090ee23a2c---zeberumojetikuvu.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zowanojawixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=government+of+canada+entry+requirementsPDF 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_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 19480 bytes
SHA-256: 5048c711adb53309130c6e4b3770293a48b5eb38ead7e7fb8f4b281ed0e9d925
font_02_sfnt_off00015c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C90 11056 bytes
SHA-256: 47b0d724fe17d9043a7d8c2aca7f7e4327b2a703a4091f7b14a74ed7af7e5ce5

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