Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e72f7f043e4fa…

MALICIOUS

PDF

107.0 KB Created: 2021-07-05 02:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a759355cedb419162f91678229513ddc SHA-1: 3d09dbbf9eee65982118fc907fe7393ea9d77071 SHA-256: 1c3e72f7f043e4fa42b7fde03b4ef641fc83ab82cf78cd87c3ffd3c248c52004
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://aduanaldelvalle.com/userfiles/file/fesomanebanizez.pdf In PDF document text
    • https://minipowerpack.net/upload/files/59173138734.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/92039237183.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/58e627555e4530cd3cc15ad4c7ef52b9/66989648408.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/xexanuzitagepupugoveg.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9834bb08d---pujivofasuruzalikonipadel.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bi8m935ttpnqp86ale95r907i0/67572873510.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/momowizuzok.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a7vu7hjehi9f7n7usabmqq99d2/4237279401.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1151bdff1---42443518157.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/losegawafagaderogajozuj.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ccbdcef0633dacd59fd7d3c79a00945f/26858870583.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c535cce26---62883652274.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/57541404297.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050305364624.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608545b32e9f3---ferarijugip.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/texati.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b94cc3af---41920225775.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/rigavenizivomamini.pdfIn PDF document text
    • http://15889163.com/ckupload/files/21609328980.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/jubumoxawi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/j5misnltqek1gko29shcdcoe00/dolovawe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/58mb3rrbu5e0v1aoesad2hmqf5/nugipedepufixawexojize.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vdnm9e52kkdtovtfk20inndhfb/gizelaxadevakepikotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=middle+earth+tabletop+rpgPDF 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.com/xap/1.0/rights/In 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_off00013b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2F 10532 bytes
SHA-256: 3b0c9c38e2e4d17c8f39c0842d30679d56be63f7a8fadec06215045ab4d53636
font_01_sfnt_off000152c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C8 19552 bytes
SHA-256: 715f0e8325e82eaf9f2bf23ff7766bb37619aa0fcca66be8a76c5eed38ff1b5f
font_02_sfnt_off0001852b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1852B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1