Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d5e6fd13fab1dc…

MALICIOUS

PDF

78.5 KB Created: 2021-07-03 20:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4038b2fba4c9d598c0c21be0ac5f5a85 SHA-1: add06badf92a6d9777294fefa90c786ea75ea5d2 SHA-256: b4d5e6fd13fab1dc9f51aa8a003be8e3733f42f8ec60350ae4e7dfe6c2596dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malware or conduct phishing attacks. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://szwygs.com/upload/62792622282.pdf
    • http://igabana.com/upfolder/e/files/20210617125021.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/61175434895.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45851dcc9---zewoxopadagorarejif.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/cabd62948595cfb96aeb9e58a0b7199b/37674485460.pdf
    • http://nmglyxx.com/userfiles/file/74168213686.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/31c4d52751592962feeb0898f6bfbee0/54658011834.pdf
    • https://baobihungphu.com/media/ftp/file/50582088750.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb557bd7a---23929786756.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/korunanit.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/18c852c501be05c7de28e215a3dc6bcb/disuzox.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7833be11---towodedivelolukixeloziz.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kad18uusfjne4o4mm5tp83sgjt/76143181003.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc81d2c87e---88341335662.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g1r5b87eqttn58vn620i085sk1/96508935086.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fbd334fc8e13047f3274ffffcd9763ac/jexumezosagakava.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6979e70ae03e3538156761484919aa2a/lunotofobumaz.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cad0b0e3---15525426966.pdf
    • https://decoveinvestment.com/userfiles/file/lexesikugenu.pdf
    • http://cualuoiskydoor.com/webroot/img/files/lisen.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/satakazerugaxa.pdf
    • https://alternativecarrepair.com/userfiles/file/milelu.pdf
    • https://europartner2.pl/uploads/40298903715.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc3387191---kesakexazilose.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076145187364---jaxajovibibukodujimiraxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=2+digit+addition+and+subtraction+word+problems
    • 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_off0000cf20.bin
2adb6a817d721fafc59fd8bbacdaa13a652cd6c1af3be13051c6b179365f99eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 11208 bytes
font_01_sfnt_off0000e910.bin
a8ca337c1dd90e360b6b208527196c85192bf096a09b3089df2aa51480786a2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 16728 bytes
font_02_sfnt_off00011482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 16792 bytes