Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ceeeb3351799b3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 12:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2127723a9da5be8fe68b26e18ce91004 SHA-1: bc638833096ae53e6ebac1c600d96377fc521b53 SHA-256: f8ceeeb3351799b38d5803e75a766ff12ff932f8d9185c22c700561a7f0e243a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs and link farm structure are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4825ef42---27732571238.pdf In PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/91766179544.pdfIn PDF document text
    • http://fpole.ru/sadm_files/90559849808.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/56745869310.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/51809075457.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wumipororunegelubabidub.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bofevu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/31845648729.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/97992033997.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/50684954377.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/boxikavovirevuganamika.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8r8gu09mj5st93fcddpqbvov2d/rexalawewovevirukuwuviw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e8593d2b---parepuximutevepo.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/705pu45tdnijqlns1b16bdik2k/54580717648.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/18024472453.pdfIn PDF document text
    • https://davaocarrental.com/images/file/5797112501.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/masomewa.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/27641909296.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e152821b6007aeec337cce89f8a7f40b/zokosarafiru.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f8b4593454de403ea60217536d6fbdc1/ditonikazubimawiju.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607049444d66e---zibikawusikepuge.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210727125235.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lf1ubn6is808unrk877s9trkg1/67302808154.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f914341c---bovelu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098913de1703---matukapunab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=audi+a4+2010+manual+for+salePDF 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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 10868 bytes
SHA-256: 8d543114131101ee1fae9e2305ff9394f605fd1009c12321d1ada4da92bd0835
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 18136 bytes
SHA-256: d93c1bc9e7a47c4ade72eb57f8185677ecc7f3ac57506bc3c399976080d47ed2

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