Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce57e61779c1b97e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 06:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27fd69a66bb516ee68637cda4108fea5 SHA-1: ec1a56f6757275a85cb9562b6c8272a7b596201e SHA-256: ce57e61779c1b97e52de96b5b23ba2e0c2cfb95fdb4ae4742b7e1edabd5db5f4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0bd33608b0fa39f722bb7a15f1165787/52905783514.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc986cb2---65593019215.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161395ef5bedbe---vikadajazotox.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910012748206.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/woxevibizegojobobiz.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wateram.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/99508032270.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/temufanojibuzoni.pdfIn PDF document text
    • http://congtyvima.com/images/Download/97668002378.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/lewerepufir.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/108154764.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/90919315849.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/gukowiwuditedafebofodefi.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dozij.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/witibedepogagowif.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/xababegesalaletaxid.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/devebupifazizibuvali.pdfIn PDF document text
    • http://identik.hu/editor_up/rufetinawaribunonareze.pdfIn PDF document text
    • http://starma.pl/files/file/42375723686.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c16ea7ad52b054a1ac0cf2cd8b0bf76d/16025447137.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/fagaf.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/45221972662.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kemamowobikululavamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gag+codes+for+what+amino+acidPDF 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_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 17740 bytes
SHA-256: beeaf6f97de7c808a3a9d2398f94d095fe7229c7a654ee9eddeaaf74e9e692df
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 11004 bytes
SHA-256: 1438d376df2d930314f30aecab67bb74e2d35170b0514c34c5fc5257967f0461
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1