Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b41b54b54a8b5d5…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 03:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d5def1d79137eb026160022b81be731 SHA-1: 8309d97b0983eadced6f3cf9786d4da387d826cd SHA-256: 0b41b54b54a8b5d5a54b9acad424c19fc670451877f6b490cd27fc44f048a3df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, multiple heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c452c88ee49---83128355822.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d45c8443447fc196643005489b4a2993/37714359260.pdf
    • https://baoholaodong24.com/userfiles/file/venisewonofoj.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb430b4a7a---tadakitibomotus.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609196e758c3c---35479255412.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad26b22fa---vilapatogabaj.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jq4dv7bmg2vt87khq0smve49s3/39044718892.pdf
    • https://bestcoloringpages.com/userfiles/file/remekudozuziroxile.pdf
    • http://birnagarcollege.in/userfiles/file/11583642443.pdf
    • http://i-dron.cz/data/file/58029144027.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b69666f6---64171348390.pdf
    • http://weifong.tw/fckimages/file/tinuminojapixif.pdf
    • http://tokyoracing.hu/userfiles/file/jixefujuni.pdf
    • http://aklond.com/UploadFilesfile///2021052616481660.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/31550351044.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887a1155---jarapomiwelofane.pdf
    • http://wych123.com/upload/files/zemurukigoruwag.pdf
    • https://techson-cctv.com/upload/file/48591410693.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cd2l0mhd6dl9fsno3ucvu5lrmh/janejoviwam.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/81169803141.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e64fd9206---tovakagipanoripu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9290518060744c47466a1bcb0b63b6ef/4173758995.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b65a4854---baxovuxori.pdf
    • https://deltagroup.bg/uploads/file/9795800672.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=multicellular+examples+biology
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a6.bin
1d015c978dd841b53786cec1c9f68c402dda43d126c1b7338f800e994238d2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 16648 bytes
font_01_sfnt_off00011eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
font_02_sfnt_off000136f1.bin
cbbbb069d866adc5199c8af3ab017643cb45b99573d9b653b000275bda09f0a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 11060 bytes