Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce29c8a8924f909…

MALICIOUS

PDF

90.6 KB Created: 2021-09-24 04:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99d30119fde7d91cbb736cc41211ef27 SHA-1: 997b59216c9d4ddc19065077e6dd05664f37aa5a SHA-256: 4ce29c8a8924f9094bcacc2d3133097ab82366fbab6404d30e12a877ac09407c
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLICKFIX' heuristic specifically points to social engineering tactics, where the document likely instructs the user to execute a command. While no scripts were directly extracted, the nature of the attack suggests it aims to download and execute a secondary payload, potentially via a link farm of compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://wsp.pl/userfiles/file/gejoxafixusixeluziburaxi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408da964798---76753328380.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0d5fccbdd9070869395fc6af30dd23c1/towiwamatoronoda.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/crl6pecfng9vcnu3qel9e1gjc7/dobev.pdf
    • https://archielectronics.com/userfiles/files/34658053806.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16146c43c102d0---64745521433.pdf
    • https://everestart.com/images/stories/file/baliwefawatarabelunotut.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/dodulevebalogonurizobij.pdf
    • http://tykhchem.com/upload/files/40914138637.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0e87ee89e0660a3c1bce34842686b596/zuwak.pdf
    • http://uforoi.com/app/webroot/uploads/files/12952701508.pdf
    • http://ddaengshop.com/ckupload/files/21317283131.pdf
    • https://romalasergroup.com/userfiles/files/9584018068.pdf
    • https://liepasmuiza.lv/userfiles/library/penuvolesisedebobijok.pdf
    • https://braveathlete.net/geektic/files/lorukevibametarufab.pdf
    • http://elesi.eu/fichiers/files/11932869774.pdf
    • http://canadianartistic.com/userfiles/file/50340230295.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/276c1a377481691911d1695ae28d6431/53103189283.pdf
    • http://mrspk.com/ckfinder/userfiles/files/pamanaj.pdf
    • http://farmaciafoglia.eu/userfiles/files/xezuzebexetupitowilu.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/76169976367.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jetaudio+android+review
    • 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_off0000fba7.bin
1b2d305d257c41ad893a645ae89e9ae2f675a1add11f850624e0854d01d03a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 19184 bytes
font_01_sfnt_off00012d97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
font_02_sfnt_off000145ae.bin
eb05fe397995e29dd3d94b7574a2b14eae18bd4d35bc9f3f4c4cbccf11de4e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 10272 bytes