Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f8dfe3da3ae971…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa6ad1ea9d397366bbf8840810fd6be6 SHA-1: 1669a4beb81841b47992d9ebda09f0edf757709a SHA-256: 38f8dfe3da3ae971b013ffaa90dd4604a2a84f1ce204abd2967d5142f2801e22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for hosting malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then password-protected to evade initial scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=cloud+security+design+principles+pdf PDF link annotation
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/jusezigovafan.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/peluxunazotowoporasanupet.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052922455219.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/59195281796.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/51460186412.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/34122d599a0cd77c37593870610c4f39/mefefuvebuzigedufawe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16106fc2d06ad3---80608971947.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210703104919.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/28620010791.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/69021160344.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/97191488147.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/48e265f00e6b0a3df950442ce2407710/penomugegam.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/45532058d3d195aab2dca9c6639cda58/54868765417.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/82d500a4ac58bce4c25a091568c45471/butafome.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/075f10e834a73c3a2a1bf33cb3e3d5de/97395363664.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a3372451719858b7b079eddefb1877ad/wegadugivotojuboforexosa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ea57b37775724cc26bd145de99328338/65924574731.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62c8087765cd53c537f8e087dfe9caef/64140084450.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4468c3ad---nelineroset.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210823202716413082.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9174e8d5e42108bb979cfae8478304af/mafazuvidexeso.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/sunotafebowavekufi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 17044 bytes
SHA-256: a6af129cfad55891fd003dfc7f6aa3a2bd7a7e818a4c2013b48a2479c91020f1
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 10880 bytes
SHA-256: 7af598e3f5b94f0794ace9c47afdcc2c8bd584ad7cdb5afc9a60aab48f92535d

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