Malicious PDF — malware analysis report

Static analysis result for SHA-256 932c38a24cbc4249…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 04:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a28096fee6464a2b9ac0122de4e5eccd SHA-1: 3e25d1bf1901eaadab5bbb3388e5453fb4bb7270 SHA-256: 932c38a24cbc4249302106d707148af6f4c93905184f39bc0c825a64eb052038
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 WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8570f8569a09f0584871567e95ecd6b5/6375352224.pdf
    • http://breakevenpoint.pl/uploads/editor/file/42526589771.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/dikerozivokul.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s4oqgnguc0p8lkrmn4t4rdek9k/39204872467.pdf
    • http://belgium-ex.com/images/blog//file/dizituzebefiwafisigogoz.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/741a3014aa94b9ad3d2b6342ae32de55/tomipegexogaf.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bd4c7f9657d3f35a7a12c3339311f2ab/62245936425.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/501ff947025131447d69054242df5fd4/fevuradutifev.pdf
    • http://aihyang.com/userfiles/file/53518923177.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/nugakulitukaxeratipidiw.pdf
    • http://aaaexpressac.com/userfiles/file/73863701669.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/pokawigalinazerabatereko.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0725367196bb38796147509086d53477/71544434108.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc6e5a065---4662142971.pdf
    • https://promise-land.com/upload/file/4176495211.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160773c1bbf64d---sasodaxapupa.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/43069349444.pdf
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/2262653028.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43a76071b11cc87d25c6102ee4581538/forogurokaxufapise.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78990243c7d0a25510d412181b8f6dce/33200857024.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wrong+turn+7+movie+watch+online
    • 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_off0000edc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
font_01_sfnt_off000105d7.bin
3f01db4cab12395430df67504c615041a410e64154262562c981f175a60b73a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10804 bytes
font_02_sfnt_off00011ea4.bin
6be915d5d19d9c217566747d16ca701cd80689b443fad186a8507eaeb9ba9066
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 17396 bytes