Malicious PDF — malware analysis report

Static analysis result for SHA-256 8256beb20bb228df…

MALICIOUS

PDF

109.2 KB Created: 2021-07-03 19:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af5b046068ec35f829c39207d130f28b SHA-1: b5d0e9a952b85f73f8010655a8fb48f9c27412a1 SHA-256: 8256beb20bb228df1b307bc238137917d3f5ccd7883b3b7ac0c2e4dfe7b9be7f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the structure and URL patterns are strongly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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 http://icltindia.in/userfiles/file/denutatixadedamupijolil.pdf
    • http://www.grifin.sk/files/difozez.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a1678b0adba6485b108e4e0bb8e26c20/74474424244.pdf
    • http://texmet.pl/userimages/file/pugolof.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8661cb66---bateneninasa.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c7e466c100d4c2c17c10a3f4c467f9fb/59723349320.pdf
    • http://arniestribu.com/campannas/file/42139429098.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fo2eguet8nsqvd63mcg3d7eoh3/vofazulosekumonuwesute.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b67792010---89046364500.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/287fb053ce8e6b918a2d3741c25ad258/bigelomenegijaje.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2e40e4fb8d8283773b181984d018c42d/wefifetopiborexurakimufuk.pdf
    • https://airflow-skateboards.com/upload/file/giditopisutozizomutogeg.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8570f8569a09f0584871567e95ecd6b5/6375352224.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/65pr29b0dtd6nmug2e943bhl5i/jujumopovixekokiw.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608332a986bc5---60191557060.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c14db5907458cd571412724ae18309e/nikepititajipore.pdf
    • http://www.aluvascientific.com/UserFiles/file/vasedes.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be872d6f6d4---88929536566.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77a2bdd3---juxifusadowupupekom.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/25989725391.pdf
    • http://markasib.ru/ckfinder/userfiles/files/42731005793.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c786f12ff---61077266684.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f857ccb21---kufexeregowen.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0eor10edjp7nb619mfmgn9n7u6/72366370567.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e8454328413deec61796ba761ec79b1c/lilexaderukemewufivezofij.pdf
    • https://akapacha.com/userfiles/file/nezotasizunakesisunebidon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+impregnated+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016f49.bin
3d9c2ba88957d6df1d3e9eb08e06b8fda47fc4f83ea5b9f6576c079c2b4c0e98		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16F49 29044 bytes
font_00_sfnt_off0000f126.bin
a9f01bc62d7160dbeb49871f2eac6e40a8c22e3d53e3c0733dfd30b1f4c5caa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 4556 bytes
font_01_sfnt_off0001020a.bin
62c66ca81e21ec22468fa2e64d2d85497eb1962185a746983293a778d8ae0d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10940 bytes
font_02_sfnt_off00011aef.bin
4446d4bc128e865eb10206bfd2ef2278117d0310548e803293b1a4b22158273c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 24844 bytes
font_03_sfnt_off00015738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 16792 bytes

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