Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9f31e9f841962c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c15ebe03c4ee3e82b484fd0886e6e6d9 SHA-1: 31526c39157b7cee8c49b07b105ab59c11e638ab SHA-256: 6f9f31e9f841962ce9b0fe8c6e0de2c01bd994e7acca92609f4ea04d5e97d19a
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on potentially compromised domains is a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://culturasiapamplona.com/guiarte_userfiles/files/vofitogunikor.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/59di69epj2529m4fs94v395vp5/9944334361.pdf
    • https://hkbca.org/UploadFiles/file/20210529222311101.pdf
    • https://mytekas.com/UserFiles/file/supexekemibefisaxojeno.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a5a8a75a---18615370856.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95048c2393b4cb8be080dd4d4dd8bcc3/76036402803.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vbft72edned1v4rsfv28h5dhnl/jamoru.pdf
    • http://sahamit.net/userfiles/file/96115986812.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f1c78279---vezudum.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/99d946306ef54502c90e3a4adcfdb87b/lubisaluboxinexagop.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4jf91h03a5rqf8m66r4jqlsd4m/55469251463.pdf
    • http://studio-castiglioni.com/userfiles/files/wokogemadupufoxegarasov.pdf
    • http://buildinggodskingdom.com/webcms/file/49743410940.pdf
    • http://nicenpos.com/userData/board/file/13403474181.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53c44e6ae---wikefusimatasigun.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ofir8gn9l237gknrp1i87h2ir/12471661478.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a8aa9e56f30725e44036c7732617eb8/nevabapiboviwutuwevejubaf.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/53526729135.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ca50add33---56671072437.pdf
    • https://sinarwaja.com/account/files/93942593495.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e9e401e2774832212adb95fe259de6d7/tewebabumefivego.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/4322137758.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/tobalasupurubolunetiwo.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/lm0s6chgnb9ticg4kd1i3ai2pl/xibulepigesofako.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/aa93f90dd83fcf2fcfd7469584d7aca8/87169736436.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf2d504b0---43195337917.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=honey+select+outfit+mods
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 16792 bytes
font_01_sfnt_off0000f239.bin
431757bad5fd8a5360873c28db75fbb497aeab961688f7099d1e741c1b78198e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10580 bytes
font_02_sfnt_off00010a52.bin
2481593405cdf2193c8c3901dee48a00f8aab08e8b4067187795ad29738dd4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 18508 bytes
font_03_sfnt_off00013a0d.bin
0735645ad909c4aeafdc86f580bc7e15173cc22a0ca708b4a9c4304e446284f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 2140 bytes

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