Malicious PDF — malware analysis report

Static analysis result for SHA-256 d315f660d8c1c06d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 12:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dde78bee44f04dc7a572e1652a44ba8 SHA-1: 1c1100059eb4ad29db8f05036f15db4c110a3597 SHA-256: d315f660d8c1c06de0008f2fb40284602a833430be36e9bf37ca8662ebf52d81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, designed to impersonate Facebook and lure users to a credential phishing site. Although no scripts were extracted, the structure and URL patterns strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+free+robux+generator.
  • 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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9dcc27fe6---80789233087.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7539ad2d7c5b10994d8cf5f15558fc6d/gutobimexodepikatodoges.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/famepefoxiboxipakoze.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46558479760.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2088aa86---kavega.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d08255a4e---suripapipusesanij.pdfIn PDF document text
    • http://beateromer.com/bilder/file/41247157061.pdfIn PDF document text
    • https://aedwea.com/upload/foto/zupasevowuwewawelaxel.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4226ba8c7209ee2c8e2d741b6f3282ec/9187297689.pdfIn PDF document text
    • http://qca.ch/userfiles/file/rurizikamoloxawakiveranov.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/kos4rv3b2pfn1f3t180ubcjafi/kaposarobu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/25791452630.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/zuzukezolasavigutetubumot.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4928d0739---notekapave.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae8aa21e7---gejafonojepesil.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/miputodiruluragodowa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d167b1d874---warudezib.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55159b22ff---xademutelisebiraz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d08f543dbda48f26ebe07957c2022152/tomotisawafakutu.pdfIn PDF document text
    • http://nfc.soo.jp/file/toneminemowuralobupala.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/438d1a6f2a0150c1668a6240b0c10f7b/zabigoledejumef.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/83476061215.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eff46d8dcdcbe1d6f72a251629b419d8/24193147581.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/daledikubifijopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+free+robux+generatorPDF 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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 17504 bytes
SHA-256: 5fafce791a36180deea5259bf9c95aeb6a18ad9aa9967e82703bf04429c792bb
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 10488 bytes
SHA-256: 778ea9c49112d1a3cbe070896d91689d8bc95a0f5a1cd2c1e9283de662735e79
font_02_sfnt_off00013183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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