Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b7875a247f6914…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 06:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 824b747f983ae99c58c63d20fbf603b1 SHA-1: a2b8d59660a5e3bc48d4613c4de90583fcdf752f SHA-256: f1b7875a247f691452e9127695ab28a88f0ebc655b3138898e7a16afc8d5671e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based decoy and numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://shastriratanchatterjee.com/ckfinder/userfiles/files/47923322108.pdf
    • http://sieuthibds.net/images/files/55202675039.pdf
    • http://world-spa-resorts.com/dok/38184545285.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/39769379125.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4da7e1af65031ad8bf2083fa96807573/vuzituperibuxukukisol.pdf
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vosozodesiwo.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161365445e02c3---tutirasazosadiluve.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/mupuf.pdf
    • http://alemotta.com/resources/original/file/52837068782.pdf
    • https://llibreriaha.com/img/events/file/75412094441.pdf
    • http://gesgo.de/userfiles/file/29462324524.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/68355610604.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/xarunenodenowu.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/katezufiku.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fb07e9264d4964de7d215f0e689e2797/86364055854.pdf
    • https://producedepot.us/userfiles/files/4541544689.pdf
    • http://chicopharm.com/upload/files/46676312559.pdf
    • https://svenjakretschmer.com/ckfinder/userfiles/files/29764699009.pdf
    • http://bienbao.org/uploads/files/reparakomeg.pdf
    • https://ahreco.com/uploads/news_file/54997817583.pdf
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/wolepalelimavigova.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bevijokaf.pdf
    • http://hrudolf.com/userfiles/buvanawunafulewun.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/jukagasifiteg.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/zorexetawago.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mario+2+emulator
    • 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_off0000b410.bin
9e587b1260b9b8f0d67bed29f386343573cabb7a93fdd2e03df209b604990942
pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10208 bytes
font_01_sfnt_off0000cb06.bin
a66ef095ba0ee9220036f903f3dd8061bd026e6a9192a44c4661b5ad59d681e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 14164 bytes
font_02_sfnt_off0000eea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes