Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d187a782494fd8b…

MALICIOUS

PDF

90.6 KB Created: 2021-08-19 06:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b585cef414241d23e193a64659a5c161 SHA-1: 6779f9d4e843032b750b99304aeb7c94120df4e4 SHA-256: 3d187a782494fd8b2327823816b5141252a00e6cb9724bee7a846b274752b2e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious workflow, likely involving directing users to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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 http://cokhilegia.com/upload/files/93008346581.pdf In PDF document text
    • https://webmenuplus.com/images/file/suzitepodedekemasukibij.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799307e7ce8---19430875860.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/33015427168.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/61295543708.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/sigazamirojepidif.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b423746d2a---85697393988.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/wesasopapezuletites.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/5299260017.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2vb9ef0401vskp2jq66lhkvka1/46493498392.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073312bcc63d---83000515278.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dea8d4bb---faxipomofukamisamusatut.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9vr43vjj4lpj6621ebm6vs895/lifezonimuto.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tavibadisixipokabo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f7270134de146b1859e4d3aab3852b27/dofuvomofimavenizunesude.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e48a7ac4d28---guxopoxudatorazotawaza.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/34207975437.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6eac389a---buzarap.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vaxidukeniwo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1faf883f1a---8798740839.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/gusigixoxugi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0d40729d---xevebinegewipakobusibo.pdfIn PDF document text
    • http://vhz.cz/user-files/kiniluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=winzo+gold+hack+mod+apk+download+unlimited+money+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 16168 bytes
SHA-256: 2f088311e3cc47affea05821c2def65328b1f74a195200b1b3e81469be6e99d2
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 11380 bytes
SHA-256: 56f3001dcc01aed40c7695b0343a9dcce80ae906dabe201c5669b8ee047c71e8
font_03_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 17388 bytes
SHA-256: 421ce27f7a7cb73cc7bef3a52871916407a401241047fc6f3fe3ad2cf7f87e4c

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