Malicious PDF — malware analysis report

Static analysis result for SHA-256 02828d152487878f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 19:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fddb51de14485d824dcec22f2a984dc SHA-1: 598066eea86a0227e2cf199f052a4f9d199163f5 SHA-256: 02828d152487878fb99854d56544b7eb43a2154fc1ea2699d9c96267e695f552
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, indicating a malicious intent to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gcubldl61haddspuodhe5f4te5/zawikogezituzopili.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/703c11a1f85503568eb0068e2f973a1d/loxorog.pdf
    • http://chongros.com/userData/board/file/tusewotodapapofozijubeb.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ai0lehl3i1v9acveoe8qm0evkr/xugutibofukezazivikote.pdf
    • https://proxus.nl/file/talokof.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be4739d17---44237407341.pdf
    • https://myphi.biz/nbloom/fckuploads/file/besezivanefawo.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/rvmvnt85l8a2nnbb7volgj690f/lokije.pdf
    • https://zapret-rf.org/web/img/podborky/files/punudum.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/iv947vu7jgo473r0v83p3g05o0/69988848469.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc6d02ff7a---wakapelitorinudefut.pdf
    • http://pelesiuvalymas.lt/i/File/pizabupevimen.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe71b67b5a---xavovije.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7153c704988ce9f5a4a96bfa14dc7498/88493600509.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/niselatosejij.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23937b40b---53794891944.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/22f00e30da2a2f365af0eca5966cdda1/20716419977.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cda2e2a7223---69333015649.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d33a0476da157d91570d60c3dba1b181/loniwavivaf.pdf
    • http://ccspatti.org/userfiles/file/jasirapekukur.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210717_9767CA3101A9FEAE.pdf
    • https://alate.org/admin/fckeditor/editorfile/52163132703.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd17863b3---zononetawipewinagojuluwu.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/331fbb6158e48f12bc8ac5baf35f02ff/24765617652.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/10f50f49a00fb013cfd2abbb813d96eb/78422539779.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=engine+coolant+overheating
    • 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_off0000f9d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
font_01_sfnt_off000111eb.bin
425524fd40b5997eded4a5728e6130df3980ee12d274c560104cf6fec92ebf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 10388 bytes
font_02_sfnt_off0001295c.bin
053cd5a2dcb0e687f74aebf4bcfe6fdd7733cdbfb320c9c0b40fc081647362fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 16468 bytes

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