Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61419d40b25d4c9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 04:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1ef4f094787966a2099d61372044493 SHA-1: 2e81c598ea6f65dd5d8c129dbbb8555cd4c66751 SHA-256: c61419d40b25d4c9874779cd1ddd4a58943e45bf48285aba5a20b0351aebd909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=complete+incomplete+sentences+worksheets+2nd+grade PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5fa9642cda189d6744edea4e0ee6de19/sipaseriku.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6f17b0d84629347df13e3fb5f26981a5/xopisuzevomu.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/20225731558.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/63381048553.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94430e460---71863595605.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab075014a8---lesanetuzi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/19792050362.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd9719d5d---10109836034.pdfIn PDF document text
    • http://labsshop.com/d/files/vuxewim.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/nobowogorugu.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/54261130050.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/xefisisezosonif.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d96579838---81624606839.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/jelozibetupun.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/12222076399.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/51504927517.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/gigugijimonimiji.pdfIn PDF document text
    • http://vce34.ru/attachments/file/71465938349.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/93038621508.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a484288b489---57087536203.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d457bee083e---nifevud.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6f08e9e87b60a1be5fe5d4590ad99db3/32340218819.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b2a32aeb---ripivesawadulonumi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6ad739b9d---68731423037.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_off0000bd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 11288 bytes
SHA-256: 69052126ec106d2baaccc13b026d015dddf66d11659f069f24c36ef58175fb70
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 17164 bytes
SHA-256: 9f13901ede40bf9279b9915621fce44c4b5ee9859115386434520b13c808d3bf

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