Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bb2ab577bbf3ad…

MALICIOUS

PDF

99.5 KB Created: 2021-07-14 06:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4da49456cefa38dc6793b17ac851ca06 SHA-1: ff6981f2df3a618e548b1c28c6aced7f50a1c66d SHA-256: 96bb2ab577bbf3adc7ece1c63396cdd323978bb6305085c885bac9ded1c39309
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 compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160975e9aa3c72---zejiwi.pdf In PDF document text
    • http://laweasy.kr/userfiles/file/16656811371.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ea2ef780d6720deb0be050d74350341e/29249126092.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bd7bca5cca1b0bbe95537342a666e567/kivarawaxezopu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8f9a366dedd35fa682366dca85ccbdb4/jozalagujevojezot.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/majamegifexixoxiluwewasum.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/474fcf882fe19ac8538534299bdcb35f/vadirelepur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eb668dbc4---vusepakuvivopolugutol.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7d835a0eae3175984318ed4a3940b6a4/39024576535.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a8354609---zubukatobikilegeren.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/6990423028.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fukedomidelejawerazodura.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a96644a7abc---9666657219.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cd14a877---19186735835.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160772b932b2b2---27738885104.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/47194d3a0b5411fc64a64e83d15b8692/tiwevaresu.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210705221852.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/9294379269.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ff9ft78coip4356r47es6j3098/47591788635.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d12b7eee6fbb09e85edda6065060b89/69282837714.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/93030423834.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/garewonatejomejezakaj.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64123146642.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5b5357b457518760a34ca8f92a0a210b/kipaweleruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+does+h+on+b+meanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 28176 bytes
SHA-256: 84ee56b0e0fc4194973c1a43df7196dbbd4b62dc72bab05f2594766983a96a0b
font_02_sfnt_off000152da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 16272 bytes
SHA-256: d9fd2578dddad7a6650f7a98bebf4646df8ab651c4007856c32a52f59ef100ef
font_03_sfnt_off000168ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EF 10408 bytes
SHA-256: cff7b2083bf4d71f2f971e513148a3974911c2225f6052ecc1dffdbd184881d7

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