Malicious PDF — malware analysis report

Static analysis result for SHA-256 b908c65a2caca5be…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 07:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b6e3b27825de38ec471743232f92511 SHA-1: b12c1335805e4a73b18f195337f3d3111a4a46bc SHA-256: b908c65a2caca5be1d5df147690acee4d46a1efd1b6bb8eae101212d2c4c9514
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=best+apk+mod+games
    • http://runbo.net/upfiles/files/16306267566123.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040b843229---8427822646.pdf
    • https://amigo-shop.105h.net/upload/files/biladuja.pdf
    • https://artbynela.com/uploads/file/8789135802.pdf
    • http://bienbao.org/uploads/files/26254868810.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/59d01292abdfe97d7ec359e4a9ab9205/zuniwabatu.pdf
    • http://schturman.ru/files/files/gabutev.pdf
    • http://industra.sk/userfiles/file/mubotelijudovemapetevav.pdf
    • http://dongduong.net/Images_upload/files/29390946585.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139700f529ca---mujukil.pdf
    • https://nusantarabet4d2.com/contents/files/kitawilizufajefotenu.pdf
    • https://mashura.co/userfiles/files/88073650008.pdf
    • http://escuelasfutbol8.com/docs/files/momopudig.pdf
    • http://cuacuonductudong.com/upload/files/57780209934.pdf
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/vetobajo.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3ba6150f11c47757e29fcb5aa4611f2a/11385680354.pdf
    • http://ladna.pl/user_images/file/juzimomode.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/78671819358.pdf
    • https://rotitelor.com/contents/files/pebusemovena.pdf
    • https://homeuu.biz/upload/ckeditor/pages/files/79191160085.pdf
    • http://fc-junajted.com/upload/datoteke/lixiloruponasew.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/xururinatekovinis.pdf
    • https://istocdukkan.com/userfiles/files/lutuxisamekuxixituwugu.pdf
    • 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_off0000b767.bin
c371018295e2fc5f37c0ce4b2d1d3e29b5fec694a601368fb98faabf6a5be24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 10536 bytes
font_01_sfnt_off0000cf4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16792 bytes
font_02_sfnt_off0000e760.bin
4488f7dcf53ad27b06813e0bbaeabd6388c9ddb506b8af5db1603b64a5c42ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 17048 bytes

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