Malicious PDF — malware analysis report

Static analysis result for SHA-256 367f4182d7662d11…

MALICIOUS

PDF

92.6 KB Created: 2021-09-20 23:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a1d4a13988c2e7bca983d87e02bae20 SHA-1: 379e42b9e8b1dc6735ee84722b3df09443ca595c SHA-256: 367f4182d7662d111c274681a977397cfff2670714cb36565537338248223680
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=android+photo+editor+library PDF link annotation
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/meriginuwafepaje.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sejosidewewejuzi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rc2htbldjnem17q4229svvni7l/92504563485.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tazewabiro.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/77064139974.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/damawimolixawi.pdfIn PDF document text
    • http://vaynhe.com/upload/files/40286487652.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/41366922184.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8edde89a9d8ac0eb22b728c613560bfa.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tutufususobot.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/1213075892.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/jejusowalumisizugoxetur.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d37d46b2---3095668705.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/liluwikusib.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/butezuva.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pifejobitozawananobezod.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210916_50A08C70AACD3339.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/falobimodabopuzarinefiw.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210921034842.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/48159480351.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32358c617---lenepive.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/39083731715.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/silaperojamatados.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guzomifojijelasaxikovar.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35776675999.pdfIn PDF document text
    • http://checopharma.com/upload/files/60663483161.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_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10556 bytes
SHA-256: db3e4647976182c94a986012b2e12257f74b8636c95b74d62d256a1eac793a0e
font_01_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 19332 bytes
SHA-256: be7e9820499c1ebe2d4b193ad11314fbac527029224efb10c0a76b7f10009b4c
font_02_sfnt_off00014c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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