Malicious PDF — malware analysis report

Static analysis result for SHA-256 71322535e41feefb…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 06:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 148491fad00ba04e60240b24e6d0bdc1 SHA-1: 589a94519185bcdadc82032276e4296397ef2492 SHA-256: 71322535e41feefb429588c7cf9d9bb2f57a8a4bbe18adfa4e2b5b34f31d3319
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is obfuscated and does not provide direct clues, but the heuristic firings and numerous external links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

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://rideabikenews.com/user_img/files/megobomopivobonid.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/ca7587db7abece9f96dec7b6c041d1f9/wejunaginisexig.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/92964629349.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c60f0cf0---bibofurozamekosagas.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7d57f6be8598eb8eeb04a4acd2490362/sojugifofezov.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/damexofisewip.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5687ca000---26729019388.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/fobepataduwugog.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zonuxepulovibe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a30c0fa1b---36207132535.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vppa3kh6gn1euvrko552lr40u3/4582148788.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f296a5897---sebaxuvusijubelakaloto.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mulotuxuxepogatuwuxikepa.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8310b75a---raluparisago.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fevikexig.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/34276911982.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/77059124688.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/pabutilebutok.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b50c295f---30448985421.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/57cc19dd40f1b8bc4e1ff526ade86dab/paxopivulo.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n3drr76vkq6v3727l7hc6400mj/wekofilotumopukomek.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rupofafebigixitidokulow.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/80881001174.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vubigemunevovovi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dq0ic8h30ap427jfrkns2ut9a4/rasulororumakusuzemake.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t5n8i0ea4ljsjh5p3qg7c577th/zanenugot.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d29c7df8d274111f7a3b5cce762c600b/66919612177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wholesale+glass+beer+steinsPDF link annotation
    • 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.comIn 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_off0000bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 16296 bytes
SHA-256: cad5400d0dcf8deeaaf6a5c923157ce9353c8d45c26b991051fdf5c4db379179
font_02_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10520 bytes
SHA-256: 5dba207d7f8fe36ca6b49da47512069074361420c7552ee68521c428c5e06096

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