Malicious PDF — malware analysis report

Static analysis result for SHA-256 8761e957807790f5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 06:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27267aec58bb2e5648606a9c995661e0 SHA-1: 330e6cf21731e07325d62c7c8990618d1c8ff427 SHA-256: 8761e957807790f599d0baaa7b8fc87eb9edd30c56eb5aec83a27adff7c6b6cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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.
  • 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://longtra.vn/userfiles/file/29594468946.pdf In PDF document text
    • http://lpc2529.com/piceditor/file/rowilanatesafomivumet.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139353ce3a---sejobudegakefurubu.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/29351455651.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/43038992039.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/zumifoxa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/deliturapeve.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/39534879815.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zufapin.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/jazifokoporal.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/nadiwafuzurirop.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161414fe0098d1---xetenatijepeg.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/suvupemebifipik.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gabunarazamix.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/14653714904.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/66112029200.pdfIn PDF document text
    • http://zeci.nl/im/image/17174133476.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/worikexoto.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138877e22d8a---9792829857.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/87016711660.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133f70fe8330---bopolubiw.pdfIn PDF document text
    • http://zuche0551.com/upload/file/25510721076.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/83471604278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=positive+words+that+start+with+u+to+describe+a+personPDF 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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10956 bytes
SHA-256: 6757ee60b30ca25f8a83fa143a1c446c2dc0a5a7ac69c64f8f145a8d251a00b3
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 14080 bytes
SHA-256: 2e600a6fcd0673f350f22bd453e1227a497af0b3ada80433983e001685e5be00

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