Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e12e68da99e6417…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 10:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6583e4ef1868ac47dd47bfe2f3a0bc02 SHA-1: 87d1fd7199f732a474eb1cf7e517376a9db21150 SHA-256: 4e12e68da99e641715f49513f60384b2d25d70a9455ce7968de733bc4ed56f51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=what+is+the+chemical+formula+for+benzene
    • https://acryl-bg.com/userfiles/file/notole.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cd17ecd8---97901497681.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb585665e67---31268316171.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608879cac6eb5---mimitotexebazelikuse.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db193410da---wekunigubivekamesowuk.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac17d0799---mudatozusidewanagilozate.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cbba2ebf---61313683126.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/t5ljgd5q5f4redio6ah7defp81/415958525.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nakulo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9e18c221---8120196018.pdf
    • https://kompaspt1.com/contents//files/37071277627.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o1i85vpaeo9v2qddbhgks1m2r6/88319060544.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30caa637a---76276070508.pdf
    • http://aite-materials.com/upfiles/file/vufirazapaxaxiririzidi.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ncoca7u6k5gke254k6vvnff8kb/96059391350.pdf
    • https://alamansyria.com/userfiles/file/23278736872.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/96bf7235104a8c007c33be9b72f04337/tasiwijijopomibeka.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7tidc2j3g183pq50qmkou4hdf4/wenatekoledikita.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d301b06cb341f992328dffd5c66a4aed/gofenizuje.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9201b14449ee0ec080115814bb4c157a/nolafidajorudoxedunuko.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/12759170683.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e067064d9f---dijuvupipepogukalegakug.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89252e35c7---fulenoxu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873dd2e621a---83469705854.pdf
    • http://mikailang.net/userfiles/file/20210505064910_363218792.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab30fc526a---gagefoj.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/31242426655.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/7nt6iks8uvosekpps7j5299jng/26929586719.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_off0000ef52.bin
47bc9338a6d9852e9a0be02d8255542aacb21ac2c4f234d564dec6a9b412e253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16288 bytes
font_01_sfnt_off0001196a.bin
91709a6536d7206109b7d608ff134469c8313e595833f67764193fe1ac2f0af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 10892 bytes
font_02_sfnt_off0001327b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16792 bytes

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