Malicious PDF — malware analysis report

Static analysis result for SHA-256 545759b52af3af5a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 22:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db4266b7496d0769ebb3186a50aef52 SHA-1: 0e746164986df9d42002ecb3f811516941596a63 SHA-256: 545759b52af3af5a2fb7cba9b3edd9ac13e48a3134424280509da8533dd61b7d
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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
  • 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://pistant.ru/uplcv?utm_term=lightroom+apk+new+version
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/82518189957.pdf
    • http://macierz-grodziec.org/files/file/betafodedelewo.pdf
    • http://namjapizza.com/app/webroot/files/88503444533.pdf
    • http://cleangroupbd.com/ck/upload/files/wajobuwadowobop.pdf
    • http://stavo-bazar.cz/userfiles/file/vosadivabowakanavo.pdf
    • https://olterus.net/contents/files/26711852108.pdf
    • http://househouse.it/userfiles/files/19584758599.pdf
    • http://letresorellebio.it/userfiles/files/11708629337.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161358582118e2---70049667504.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ea1da006---76488223989.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigagewatanowewikeniz.pdf
    • http://abwlanham.com/uploads/files/fujero.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jaxizalafolozazus.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_161755.pdf
    • http://studionegro.net/userfiles/files/dajabeguxedevofeg.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0fa4636f---17631890797.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613537e2d2c9b---noxebunufugaketumuvi.pdf
    • http://aelma.com/sites/default/userfiles/file/bevagorexenedelibowu.pdf
    • http://protok.pro/upload/files/85796714930.pdf
    • http://jonme.net/ckupload/files/7465659287.pdf
    • https://85097781.com/upload/files/pujojofowijaleruwesir.pdf
    • https://kaktutzhit.by/uploads/files/8479807333.pdf
    • http://traktor-tv.de/sites/default/files/file/ravuwabiweda.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/39421449984.pdf
    • http://willowslakerhea.org/userimages/sajamebojulomovum.pdf
    • 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_off0000dae1.bin
2df593fec5e1fe770a4da7ebc5687f9c6533a13b48b8db26a9316e7b0599d8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 17000 bytes
font_01_sfnt_off000106f5.bin
9e1e2e124b2af976fca99d17db1886d7d467ba02a685abb0b6bd7b3e0b643fad
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10856 bytes
font_02_sfnt_off00011ff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes