Malicious PDF — malware analysis report

Static analysis result for SHA-256 0649aa92cc5d61b5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 07:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6ea7aad42295c13f64b77a1238830f4 SHA-1: 54308b9f021b9ff2196e408bb8ff7428f40cc54b SHA-256: 0649aa92cc5d61b5c4b5dabd7a90ccee89eeed7351b1f3e3a7086cf3349989a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugupawetenofu.pdf In PDF document text
    • https://ljlconst.com/admin/images/file/jetaziwovakixisurir.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/96714933463.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/19962497385.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/vutofavuremetusure.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/woneb.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/40d3a2ff91a75c0d479c135eb065d938/74101832221.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zesutajigebijuf.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce69fb0e---98987087891.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a949cae2---bituxan.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/34cc2ebcc2d84cefcd9253ef7024faa0/pibimo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248688fe6b---dazali.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/pomapafuwaregevuzovixixa.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/73676933807.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a05074d---28996034194.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/rerotepuzup.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d9883861---mobunebonuxubejivijuk.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/87872289234.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d678568dea---kavewisibuvelo.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/mibemajiper.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b250042f840a550997b43e04ed3d4f51/82349706655.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/93568643148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=series+your+story+universe+mod+apkPDF 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_off0000c096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 16388 bytes
SHA-256: 8fff2d77455aa8a1589a144cc0d4ee3c82a5369e096f50bf1e806459e90aef81
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10956 bytes
SHA-256: 25fae7f669e99b9994770eb0bf2227468a35cf8b97f95e6d8c1b845ec2f7f432
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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