Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a028baa8e8d646…

MALICIOUS

PDF

96.6 KB Created: 2021-09-21 16:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d55c77bc35527094f2add29ad77db88 SHA-1: 5481c3a6a691583ccb09c1916b7b2bcf697b942b SHA-256: c3a028baa8e8d646a07cb36641e7ff82b3c84e855bcda7be70b9db2f13d24311
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised or disposable hosting, suggesting an intent to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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 http://www.lircai.com/web/inline/file/lawegib.pdf
    • https://fanaf.com/article_ressources/file/77905919268.pdf
    • https://madeinstlucia.com/userfiles/files/74587642741.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/pujadugidijija.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9d8me68ce9fng98mfqj376uldd/jujanivukupi.pdf
    • http://imhome-listings.com/userfiles/files/sufugabuwuzan.pdf
    • https://ctcitsupport.com/media/files/denodufisusopuvidajev.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/53553588965.pdf
    • http://velo.hu/UserFiles/file/24737035571.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mqb7ci4m0rrovl0lte1p8dv6f8/75317066820.pdf
    • https://cyberbirddog.com/userfiles/files/48785178970.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163651e051---mamuzaf.pdf
    • https://twinscooking.nl/twins/userfiles/file/54803160096.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/18029719984.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/47727185508.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6f6bd671---42459295063.pdf
    • http://doubler-son-capital.com/photos/files/72711228279.pdf
    • http://ansing.nl/userfiles/file/77335676087.pdf
    • https://egc.ecrom.work/syo/files/4280815090.pdf
    • http://macierz-grodziec.org/files/file/dedebutiwisejuni.pdf
    • http://gizmakina.com/depo/sayfaresim/file/16376521757.pdf
    • https://ehlibeytalimleri.com/resimler/files/zevok.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/paronufofunubim.pdf
    • http://0-50.ru/userfiles/file/xolirezatuv.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fusunegaramegodobos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=xoay+ngang+m%C3%A0n+h%C3%ACnh+home+android
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13c.bin
67a50b0837e3b0b461dd1fe5343f208f162eb003a78753b6543479b766c4d7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 16428 bytes
font_01_sfnt_off0000f7f4.bin
759ec0837db3a75d937fe761c4d4530b690686ae09a6f94f100f92b6ab4ad364
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 24968 bytes
font_02_sfnt_off000137e5.bin
6b9ad94674b5d2baae895ed61bf674f29547c4fdc38daae09b5b1e0b719ffe5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 10752 bytes
font_03_sfnt_off00014faf.bin
3cc8a62c510cf61b6e0b78164b43afbfa54ec56cb882c6a341d2014e17d809fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAF 2076 bytes
font_04_sfnt_off00015920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15920 16792 bytes