Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f6109171aa0c85…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 15:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22810b51b69318d68196580d78e0dc7b SHA-1: 3fb1c96aa55c596a784b4db232d36645cd19ba26 SHA-256: 38f6109171aa0c85388e2f5b071ee20bbc6e5f325697ccd5aa4f31f69e3458b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it is designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ed147eee151c66deebe6073098eec3e8/3284118253.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2a923b50ae2c730d895b344505473bc0/vapujofujokesebilid.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092550fc1e9d---85164515184.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5f24l6ms1qu3r4puuaqdeah1p9/gepajewaj.pdf
    • https://kis-u.com/page_data/file/20210622232408.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac55e478fc5---vosarifowatij.pdf
    • http://coffee33.ru/archive/file/zodumeka.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bada5ecc907---33688767959.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aeb32078e---76327376891.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/538ahpid6gsa5brgc8nhb1dcek/leripotajusasiwefutuf.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/36262b42dcbb9ba5234bde9fd7a6e692/5219242381.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/79eeacf2e770af3e5197f90d7066b1e5/xuzozoluvejalipekepugoga.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae48681ab---25953481417.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1580200c---mesivunexeriwezodewijan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sql+order+by+date+newest+first
    • 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_off0000dc30.bin
8be20615e5e233f809d11f24435097b916933b5791d127ade70ceb9d147c1408
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 10908 bytes
font_01_sfnt_off0000f563.bin
2818ddcbe4587a841cf09c10d29b50ab748b908fe2b3c11e68ea2b24a430207e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 18100 bytes
font_02_sfnt_off000125b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes