Malicious PDF — malware analysis report

Static analysis result for SHA-256 789bd4282086f979…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 23:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6702d8a06a004a755d74d2a99794f00f SHA-1: a5e90c56a7747b27813e3488dc2b69d3f143c7aa SHA-256: 789bd4282086f979ed5c5273a83f6963efd42e63f454b576af6664e42c343e82
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains numerous links to external sites, some hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further stages. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users via T1566.001 (Spearphishing Attachment).

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 http://geodavidepini.it/userfiles/files/gikiwefotejujeranawa.pdf In PDF document text
    • http://chretkinia.pl/userfiles/file/87773354590.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/32002956723.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614facf2db87d---kekegulodofufofemizali.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xiloladisevuw.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/15218604739.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/6641112072.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091118082341.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/21942573847.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/goveluruligetemuvasirur.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rodinomawaminevuwokugefez.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/4723946092.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/71205983752.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/kutoledulenatik.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902113244.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • https://tukangjp.com/contents/files/relukaxojedow.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542c10274d9---guzibitumizejewokomuju.pdfIn PDF document text
    • http://apicn.net/upload/files/67453396082.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/27186179976.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/048461a4a78a000fe319d67988fb8b35/xonijez.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/68843868862.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d02cc1fa93583b6af14b544daf6fa805/66416390111.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/lixul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=use+bluetooth+headset+as+microphone+androidPDF 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_off0000b266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 14372 bytes
SHA-256: f0af7888628e9629bcb850362f7c5a949745a99c4d84c6770f718077291590b2
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 11024 bytes
SHA-256: 3104e77d918b0018ce1c681133d29ac686a7eecb49307b2f81c8a34e5c191443

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