Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c5ce0ee5b823b2…

MALICIOUS

PDF

135.4 KB Created: 2021-07-16 04:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 806e52870ff1801ecee4f523aaabfec4 SHA-1: 6caa0c7fa14fac1a085e996fb9e5a26472307f5e SHA-256: 09c5ce0ee5b823b2c5816b1b945ad98ecc30f2f5980cbf7ca75e76ec51e295e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/251a82a8591b246e3b98b31fe301ae96/kanevufufunegoramiwo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ba7e5b33---56014000320.pdf
    • http://epmachine.ru/d/files/judaj.pdf
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdf
    • http://biotledlight.com/userfiles/file///79256739838.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c66dbbe9b4---zuzowatanosomegulasitibi.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d405553f---13481628970.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ecb85a129b62cc555333835937a55f04/pazaritoxunekawipex.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5fa43dcaa---bekisegid.pdf
    • http://w-f-l.de/user_img/file/nagarepuxawuselusafil.pdf
    • http://micronforgacsolo.hu/UserFiles/file/lowulo.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvala.pdf
    • http://lmyc.net/clients/875386/File/vewexiz.pdf
    • https://bushregenerators.info/userfiles/files/raxafatunukobajafateb.pdf
    • http://acutecardio.ru/sadm_files/ratozuzofu.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mogmk3ukm4g7ood4rhjvu90ho1/tivadet.pdf
    • https://cottonweb.net/userfiles/file/67842194905.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd91e0080---71801864979.pdf
    • http://aaz.sk/editor_uploads/files/89402203848.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3elrip9rfvoa6ddekocic2ose3/jarerobimapukuki.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edf5727b---xetowuwajusajexerepul.pdf
    • http://bronia.org/userfiles/file/64910556349.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ml5q7j22jajpenjubm17k9516/44696820233.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607098ef3ffd9---72013255651.pdf
    • http://ruresept.ru/files/file/28019467620.pdf
    • http://cropscipublisher.com/files/upfiles/file/dumenegutazamajab.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160976675245a9---26813635122.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=54+as+a+product+of+its+prime+factors
    • 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_off0001b6a4.bin
2b7d63019119d2e51e431128d51b90716521b84431457cf8a7982d1d44c2fbd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6A4 15816 bytes
font_01_sfnt_off0001de62.bin
04e0d4a297c602b7df2bc516b11e8d5cdf740289d7561533525e73ffac1dc428
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE62 10844 bytes
font_02_sfnt_off0001f78b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F78B 16792 bytes