Malicious PDF — malware analysis report

Static analysis result for SHA-256 681da3137022e473…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 17:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb9482df0eba31a08294aa5491d26c9f SHA-1: 01755c91b7f10067c3346a95ac6607a183735403 SHA-256: 681da3137022e473f7349b4293f580bfa83ef1b8201ea4b486988e8d553950f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The embedded links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=block+calls+and+texts+on+android PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515086eb56---sewunosojezojepujidokafe.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0afovbrqa1n9ts3b2qd75kjr59/81225162779.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/pabavutaxukerajularerino.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/8045147434.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40ad1e7be---60714726995.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021919_94546_140.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fesodojezelidevim.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/filovunipijededela.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/079238033e113ee028c8190a77149225/67892395075.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/goleziwo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zulati.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ruduwugupenujevigozad.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/19858848793.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xobuduziziroguki.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/65734709310.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140797f638a3---23194494506.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0ae2d3255---39160256102.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210911_3DD46B2D60DBFBEC.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roxixugowemibolevife.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/jilunodawopetul.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1be3d669---70166673998.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132362d0a344---teluwupupatuzu.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10612 bytes
SHA-256: ca00e8ba20a90c8782ec309048d9caf5203b64b43882f7e9314d20cb253f2653
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 18024 bytes
SHA-256: fcb8addb3c659152a637af97e555fba67bf17b6ba78b3064d601e0a0829c46e7

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