Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c9356558f17cf…

MALICIOUS

PDF

71.5 KB Created: 2021-09-23 15:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 284fbdf0f84d274eec3c1cb47bf00463 SHA-1: 8450b62182190674f2a76b91de778fb67437dad3 SHA-256: e41c9356558f17cf726622face4ac706e80cb0d1822d978d048e290d458be8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to various websites, some of which are hosted on compromised CMS uploads. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple links to potentially malicious sites suggests an attempt to lure users into clicking through to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=gta+sa+mod+app PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/gazetunesifu.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wotawadudel.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/3253603427.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/resinuwopevib.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/tetalobafisol.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/parulifajumorureposepipe.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/51028290189.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42076cffd---6605663868.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/72602460797.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/zaramev.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210921041545926.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10a2d7560a12eee12611f0bc07278402/liwetadunep.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/93378691812.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fc770efb675736b21a406a90f1911e95/setojopovidolopiwokodubuf.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/jububobutegexug.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/soxokute.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/47637827798.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/71909016559.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96331540025.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/lelakofikumanosemetulidam.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fanimu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dajifadalevemotax.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • https://atlantidegattico.it/file/xufojuzagizilekibu.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/pegesuvujawupanopud.pdfIn PDF document text
    • 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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 10120 bytes
SHA-256: e5d1e7cada2e3269fd98cde6502f9c418b961b4eb94a62ffdc2fcaac55281351
font_01_sfnt_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 16120 bytes
SHA-256: 9a99cdc54ff5c512e8b011beeb4ea526ae65962cf0f1ab3b443a7c95890e9097

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