Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ae8b48bcff5180…

MALICIOUS

PDF

155.0 KB Created: 2021-06-28 07:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdcee1f7f8da9bc83548f2eee9eb4873 SHA-1: 77896b1fbdc3021d2f05cf6586198160dcf13584 SHA-256: 78ae8b48bcff51806ead8428f14279e38e9337302d3e6a1483fc560e6643f8ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=linux+and+unix+shell+programming+by+david+tansley+pdf PDF link annotation
    • http://poslovniimenik.net/firme_data/files/tabajibirutakos.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/nekawotenulelexerosagavam.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99581441976.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855c41ebe09---jafabesot.pdfIn PDF document text
    • https://beaszemin.com/files/9479776361.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/69e50245e1525c99d25d50836c362d35/12564199453.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/nogesolikawelapo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c1d84214---dawonigilipavu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b0599b6357d21047543d34baf45d3f39/46982315094.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/xasike.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xerazedenanozasefu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7ec9eff95399b8c457ce54af2823259f/74560180822.pdfIn PDF document text
    • http://abnicum.com/files/file/22871529050.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/785f8352d7bded3a0b4def964c72aeea/96606234717.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d71595b00---sirowozozozazisavujudavo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujesilovaja.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7j2bkpkp273963g8lln17cptgv/gowob.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/28199755023.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075d214c5267---zajezizifin.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/papefojakarubituke.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/daacd7a75197b8fc2b46d7c638342b87/97421309112.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cda518fab---jubibuwufafefegonoj.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/zapiriduvorupin.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48bfe6e823---91212835071.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c3d4a5215---10143019483.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB06 18512 bytes
SHA-256: 6f4cdcf187037ed8bb1fd216602a63714b304eace5a71965cfd322c9a1e86da8
font_01_sfnt_off00022b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B9A 11424 bytes
SHA-256: b46837b67ed3e367b92db38e33710960c8dadffff0bc832743d66c954dfc4b16
font_02_sfnt_off000245ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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