Malicious PDF — malware analysis report

Static analysis result for SHA-256 7380a34d9dd16336…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6474d1c2f31ca515fe4fac31ca84ba8 SHA-1: 4ba6dcad4af1c1583acc9f14f2f883d3684f2cf3 SHA-256: 7380a34d9dd16336f134ce35fed02a6231663118f0734d92685c60e6d541e555
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various websites, including those hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=village+house+quotes
    • https://charterfori.ir/basefile/charterforiir/files/80681641973.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d114b8e75---newubogosagabebekone.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/37415437597.pdf
    • http://cuboni.com/uploadfile/hong202106140553004116.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/aagl2sf3mga35vokpggpt2i2g1/xepudidijuvemipe.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6169a102---45861534527.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/blot1q2j7gp6ohor64eatlb384/mezigubiwekowatidajex.pdf
    • http://russia-ex.com/jevapokonivogulajo.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce289fbf838---gakilup.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0849e50ba8---49548533609.pdf
    • https://cuisinescartier.ca/upload/editor/file/nogonufivasuv.pdf
    • http://files.ibiza-ferien.de/file/52284080145.pdf
    • 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_off0000e194.bin
2ec57f0a0592547fff38ad3f41bd2c962c7481ffdc40a1e595b6a729cf729a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 18248 bytes
font_01_sfnt_off000110c2.bin
d6409cd1eae0ac2b294480d2c31194cdc04ebbf9a71afdcd8b22da1d4270e06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 10400 bytes
font_02_sfnt_off0001282c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 16792 bytes

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