Malicious PDF — malware analysis report

Static analysis result for SHA-256 288610bb8dceecc0…

MALICIOUS

PDF

96.3 KB Created: 2021-07-24 02:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6ca3b2d6082999b769f30f81d6f2831 SHA-1: a35c2b2fbb5c2a305d21bdd6daed25fc1567d9f8 SHA-256: 288610bb8dceecc09c2dd754c4d5285f0ba04bbbab3f3a02180eb94ebfe87722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://prime-standard.com/piceditor/file/63025061886.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/978fbc41e78accc3be194bc780484f2b/xufovedesa.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/31260010756.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/11920060561.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/78987687111.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qhslf3mhqon4dpc5a9opgdam20/38489182788.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/57459745105.pdfIn PDF document text
    • http://sushi-belovo.ru/files/30812629430.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8efdfc1a0a---verifolitux.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d7ad9523edf3bd1855956dd52a8b0ff9/83271150529.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/dee4010ac18d5c41323492d081e9f530/66396455655.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cade12acb---foviwumubexalep.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d8fb5606ac876d1b685fe691125db0f2/76931697346.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb31374fea0---sozofurodavijatogufowiwi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/927588156218cf5eb85865ca651f57ae/65810447398.pdfIn PDF document text
    • http://ruresept.ru/files/file/8176373383.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/zataxogumozigodagajisub.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/23067134741.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dc9fad012480d20d95eeafcf24677e39/xuvusuxawegafako.pdfIn PDF document text
    • https://buka.ru/sadm_files/ranuwogu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/in0g2r20ko5vsanbjhsie15ih4/wibinifamexiwowujunip.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kalovujoxif.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/79909950032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+drone+racing+league+simulator+controllerPDF 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_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 10880 bytes
SHA-256: 418ef5d416fe7dc35ff65dfd52aa985c245f395115d4f3aebb4f062908700df4
font_02_sfnt_off000141fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FC 18528 bytes
SHA-256: ef982bf7391d07898baaa6845a1a246ed8ef63fd28e9eedf8fb776ff728d6cac