Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64da6a936e5d3b6…

MALICIOUS

PDF

100.5 KB Created: 2021-09-06 19:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0d1f96d9328e64f62d9eb460cbfae45 SHA-1: 0612c20da0d08c91e925e2dfd81f1136e029c799 SHA-256: a64da6a936e5d3b6c45b1cb4bece98699e1cb213b81fce22df485ae9dafb90c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://catamma.ru/uplcv?utm_term=cards+against+humanity+card+backs+pdf PDF link annotation
    • https://ms01bet.com/contents//files/vubibolobebuzawisotileju.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a72621eb007---nixufijeloses.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb18781f6---13582052292.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128999339224---lozusotusudapemof.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/kasiwogejurejiwen.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0af3c02df---85357333226.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3b7abc64---24204064584.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/6743022223.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/81319187845.pdfIn PDF document text
    • http://clarasonic.com/upload/file/funudo.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/40955658823.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/sawuz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8394c4ccb2---sedotebaf.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/61103012386.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/rajake.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f397dec5364---76351895090.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/68263745206.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612df24b16a3e---pirevugigobowi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b2c57a9ae382d16bbdb65e3b1e62ae0e/dixotatiniraluwolobudi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83352747515.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/3176221660f8994e75662.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/407fdb717acda02d2d75c29c1c3dcd77/99764895636.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/89379906035.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_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 19644 bytes
SHA-256: 58d05431a5c5f9c7eb06999dc6e99b3064b25bcd188b6bd9760d24214b5eeef9
font_01_sfnt_off00015272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15272 11248 bytes
SHA-256: c3174c66b5fd3d5b7535ba4fe5ee4427ef4fe47e4b6cebe2e07f1c30134518b3
font_02_sfnt_off00016c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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