Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1fcae15531918…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 12:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e84c9b1b7033214ba442ab5721a12cc SHA-1: 64b916f8d40ebab7a3775789ed1cc1a3911ab383 SHA-256: cfc1fcae15531918a6e165be0a4d517f344cc2da171aaf5f2775dbbceeddace3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to potentially compromised or malicious websites, as evidenced by the numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://812423.qqtogeljackpot2.com/contents/files/denogopewuki.pdf In PDF document text
    • http://rayanchem.com/d/files/karodonekowaxojavugizofew.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e118078e54---tizotiw.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/gafixeremolinika.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/paluramaworopatosezip.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/jiwitemokigejopofesodi.pdfIn PDF document text
    • https://cecprint.com/images/file/folinokizanafanelifivapam.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109110749133613.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/49339389112.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/zitaladabafuw.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zugimedovos.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vijatopumiboxopera.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/54016454206.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210921_5E7FD4462A0C97B8.pdfIn PDF document text
    • https://bunianco.com/other_files/File/6544966723.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/758ce8012ebef15075b29b2a9fff691d/92836686451.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4kmbnfolfd2ukqvbfrdb4iggcq/83540358487.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/walotuvan.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/30505005655.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/pivifumuxizafoti.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wafijutifalafebokoxiranez.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/gavulezofizegafoxudofivu.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/zilowusagove.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/varitufezepowuwogugepupib.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/48303584718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mune+the+guardian+of+the+moon+full+moviePDF 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 17040 bytes
SHA-256: ec4e435c7a91d530808f00f1993c8e0d4f9395251787ced3825af3b4b3288674
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10792 bytes
SHA-256: 3a1f4d708ba4abfffa7db07ceced6f03f953800f86c75177d0d4361c2f004181

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