Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f1b4cb3e9c51de…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 01:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: edf51bfa08ed5345008ee23ca9235138 SHA-1: 96c65e7facc7f0c9dde7628147cdd066801d6700 SHA-256: b0f1b4cb3e9c51de0dc12c772f110d33bfd64da189b251bd12362bb7048819a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=state+governments+of+the+united+states PDF link annotation
    • https://10s317.com/uploads/files/202109021558179532.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3b672d7b---37015658892.pdfIn PDF document text
    • http://dhf-china.com/d/files/kufaxeweledinenem.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/58010358674.pdfIn PDF document text
    • https://cncunse.com/d/files/38225964084.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c3c1dc05b55c68e305235e7fbed085e9/33144390978.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e22542d629---1476259460.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/jasolafoj.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/27997994180.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/95916610931.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/16521532825.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/326c844e34541b6167837cfb886b5393/12364123599.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/zironidarebabigonafube.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cebdd38aec---dexowilirevebimalatexuli.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/69293353453.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/27078780810.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210914_608CDE7C0B0FFB08.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/wexumubogug.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbf663994---66920026619.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496fb86365b---podomev.pdfIn PDF document text
    • https://granitnet.hu/editor_up/panamevanolagesemolule.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/18265792385.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210906_112EC916BF640548.pdfIn PDF document text
    • http://centronegozi.com/public/86101514840.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/vilalujadesokoliga.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 10996 bytes
SHA-256: 29914b3e8ee4822d241238ffc9aeb3b430b280a1a52d0b922c53907a8e9ef0e4
font_02_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 17260 bytes
SHA-256: 9ea3594a856f4f34a8e12d1d603eba3e6f1c69102cf1c1709504f607858dd99b

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