Malicious PDF — malware analysis report

Static analysis result for SHA-256 3161760aff2e7d29…

MALICIOUS

PDF

83.0 KB Created: 2021-06-30 20:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef103728ab0323a8cad4717b569ecc0f SHA-1: 06b2e4b4a99d60d6f0f0b98805ea362a17115f7e SHA-256: 3161760aff2e7d2969a496fa570558c966fcb15db2f4df0ace90be4213042156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external URIs and link farm characteristics indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dagvandearchitectuur.be/_files/file/60011593434.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7fd7bde62e810916e541c02a388d6840/xusozomejipupi.pdf
    • http://vetranhtuong.info/luutru/files/dulivu.pdf
    • http://syuncyoku.jp/upload/file/wiramiwimivabafupolixot.pdf
    • https://aronabritcan.com/userfiles/file/pajexagomulejod.pdf
    • http://trendymamy.pl/userfiles/file/tadudefigimomipejumo.pdf
    • http://aweibel.com/Photo/file/jusewapilixaxiji.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e49f165a5a8e3a3dbbf70dbf567680a5/besalegitipazoda.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8qbskbk4lq47kk6iimqmjaus62/81002811253.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c398629675b78e7b34bb048c92d39feb/devoxofosaju.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160be823958551---zekubelolosawilab.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607851e9a6f49---56612166265.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kjsqt2orlc03tk47jcntl55idu/46055627566.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609671b747fbf---67667807358.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bde3426fa---tawijarej.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb95747e9f3---kedekawonaxa.pdf
    • https://nezrenpin.com/calisma2/files/uploads/53105781997.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njocglm6k2nncudl6mffa08n71/duruxuwaxibapur.pdf
    • http://headrepublic.pl/images/files/fepemukasolodekimuler.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced39c0608---10827637940.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/46690834732.pdf
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c438d429---pufegasotamozodafotawu.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c9684de5d3d7a558b878d2c10d7770e5/tafaxepixaxijazizo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j7iaigvhlmgevqodlnfrj9sju8/vepekojoronapagixinuzo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d23757d7---vuzovariwiba.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070785ddd06d---pivene.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6cbaada0---28644862348.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pirates+of+the+caribbean+part+2+download+in+tamil
    • 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_off0000de03.bin
13062f9b8cb72c4c01e0694c725832471ad538f4288f52cd322203b2eaeeaeed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 11232 bytes
font_01_sfnt_off0000f802.bin
29ccfd03171c4a3b5451a5752e20d42e4b9b8022c8cdacd8f5aa4083f9913efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 18060 bytes
font_02_sfnt_off000125e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 16792 bytes

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