Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed3ba0d91cd131f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89c2078b22d02697e16b8fb51219254c SHA-1: f3d06972e2e4029aa6d6eb9591a36cbbcf72e71a SHA-256: aed3ba0d91cd131fe9ab3c24d509ace92727837820bf146aada069b3247b3ba5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://zamdq.com/filespath/files/20210904114443.pdf In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/68141267169.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/luwoxudemezadatuzi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/vefovafuf.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sipitutuxitef.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/28150015460.pdfIn PDF document text
    • http://phm.vn/upload/files/kebimofokokefulikefuwaneg.pdfIn PDF document text
    • https://viettrungson.com/media/Files/99312540961.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/xupebat.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8b9cffa392614f898c24dff789b23507/pojogitivapoxalofofixukid.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614619f11b35b---62278810813.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0a3a2f1a93c171cf75e28a24c2f21471/98289747498.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/47114354844.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/73761784160.pdfIn PDF document text
    • https://membermimpi.com/contents/files/jopewivatubavewopese.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vaxuboworodowelagikiwovud.pdfIn PDF document text
    • http://erimti.com/userfiles/file/kusijavuj.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/ganar.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/moweruwasutolewogujunad.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/77227216770.pdfIn PDF document text
    • http://chengzechem.com/upload/files/mikovinapafojisazubajud.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/83467607772.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/29695736679.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a67806ca30a58b3d040dc573e8f13e80/35155379566.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/muperise.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/pinajilomomatetak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=123+mkv+hollywoodPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10264 bytes
SHA-256: 366ce70b84c3b4db39e08c3d753f248f8f1a1a27250bc4a8b31f3cf63d9aa25e
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 16228 bytes
SHA-256: 764ad4ec95a5456268dfe8db06a03a89854e0ddd4bcef749fd0280e1ca52cde9
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1