Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd7250530d98257…

MALICIOUS

PDF

93.3 KB Created: 2021-09-10 04:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7256bcf5471d08bc11b3dcb1c4db0aa1 SHA-1: bdebafbfd214c159abfef6338b89a085043770df SHA-256: 1fd7250530d98257a3d8f8fc581481883c3531e7b98d885dd02ea39b80630007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and link farms. The presence of numerous external URIs pointing to potentially compromised or disposable hosting, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings, indicates a deliberate attempt to host malicious content or redirect users. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=person+of+interest+season+1+episode+1 PDF link annotation
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mikitofiw.pdfIn PDF document text
    • http://praguetransfer.com/files/file/48195901671.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mofadazofit.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/82590690736.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/wisezokumodeluxuvi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/siviwazowugelix.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/niff83jcq8h4ho5hqbrb0hcbi2/72175708673.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/54448158375.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/95183313010.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/gaxugitabo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/damubesuzisirokezuxepaf.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kivedoruwugesofelogana.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/66205101673.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/205b595c75n0lv1a3deod4fr6h/56799289093.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/67237113629.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53416911339.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109081211111754.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/44855774379.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/kumagijupikom.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/folakuduwigarinituwa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4f96d696a5a6c0c191633209bef1d427/66683305587.pdfIn PDF document text
    • http://klpa.net/userData/board/file/2883311407.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/12121185331.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2eb429c2059cbf1358eb513870a83089/xusoragulas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10496 bytes
SHA-256: c1936451f74b6df7aa8df688e76b5e1bdc32c277269b3fb4b6c04d4f294051cf
font_01_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A69 17612 bytes
SHA-256: 0f61c727058dac44fcd674b5f9e5ef55fecdd653f5086dafb724f7ca46e49a24

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