Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd30ac3cf4501c9…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 05:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb27b7a5ad402055b87c585b81f7d56 SHA-1: b71b31c007b179d04f9e9d25a122067ae7da0dbf SHA-256: bdd30ac3cf4501c9b4f607222857d556a8d2ee5332285cab75f7cfcb993776ed
184 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 compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_IMAGE_LURE' indicates the document is designed as a screenshot to trick users into clicking a malicious link, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://penzion-pod-rozhlednou.cz/img/file/412996179.pdf
    • http://shortguycentral.com/ck_uploads/files/57084731720.pdf
    • http://intimatehotelpattaya.com/image/upload/File/napisulolanepelexot.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/84272010605.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161342279beb82---lakokakasap.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/64453590580.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/90081570534.pdf
    • http://goozzl.com/userfiles/files/didasivuwapexe.pdf
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdf
    • https://peterdegendt.be/file/jiwomunitujevibebuvaba.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexixowuninepam.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdf
    • http://abwlargo.com/uploads/files/mojilobafakebosutimupu.pdf
    • http://cke.hk/userfiles/letesorirom.pdf
    • http://tangneylaw.com/admin/images/file/mosajuluxodokamolidivav.pdf
    • https://jmtours.co/aym_image/files/gojuruzubawumowob.pdf
    • https://comptables-publics.fr/userfiles/file/9782738398.pdf
    • https://rlmahtani.com/userfiles/files/82248714115.pdf
    • https://sunnyrosesschool.com/userfiles/file/riwoxagisujanol.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8d97i0v2q9pqqi2frs4acj5rfp/didisagekejevom.pdf
    • https://fuoriscena.eu/file/lojatunemegabudekibu.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/firugafalupedum.pdf
    • https://dialogueinpraxis.net/files/docs/ponumevuvepirisurabum.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff698a9195---nixebavuvefi.pdf
    • http://dogomanhnghia.com/uploads/files/regemelobutero.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=battlefield+1+download+for+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 16792 bytes
font_01_sfnt_off0000c963.bin
aa8040b9d9d6aeca792f009895a19ff6f40a81abb33039aacdc0d687e74c7e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 14204 bytes
font_02_sfnt_off0000ec8e.bin
0453fd7e1f5203e1b56e5b0c95063beeb13a1afd08059fa1d4fdf17b0a0ab41c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 10368 bytes