Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74725fa1cc117fe…

MALICIOUS

PDF

94.1 KB Created: 2021-06-18 10:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 42a92990debdeaeb40f0330a1cee0d4b SHA-1: de9b8701016d1f6ea026fef00acb8f23e41a87e2 SHA-256: f74725fa1cc117fe2c155a9a0f68d5bcc91d37e6b985ee0f77ca3926d048b7a4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories hosting other PDF files. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2arj45vdvjo00arg1g0d9sveb1/pefisununosagefevoza.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2te683atnk1fhnl8o2a411pg1v/bawotuvu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077335fde929---rinatonejajasenoviz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba7833605---68042115216.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f566bce3fa---jegolag.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20864dea71---71990247439.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a9368620bfbfc313f4a0094b2426cb79/25437599719.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62aac4fdd---pikofebat.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2ff564def7eb1661e81b32041d9d411f/7515835312.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c3f93996954e3a2b351cef2542537e8/32383722678.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sfkqj7d560cs2l36i333thg4v0/guxemaribekebarov.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/29224388980.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/73433678243.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a0cf8a8---74098897138.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/81279360483.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae33120358---vukuxadomesileburefonu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m1qbuu3psdal702k9k7u0qkemo/47020922699.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5d59eb4c---tuvosadarilokamadegejez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=elements+named+for+famous+scientistsPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 6416 bytes
SHA-256: 4257b5aed261ccb96d7b6b52587b843e34ad9d65b35b79aec213b77d78697daa
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5124 bytes
SHA-256: 7c9e4a17b32f94768f5a37060dbacc0393b36ab411436ee81b0bf637746c2178
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10868 bytes
SHA-256: 65d64082da0e070724f33e4311d730f505751d546d690f505c6fc54ae1b71cd7
font_03_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 10640 bytes
SHA-256: dc539518609aa35e92e956e9266963068497905ebd516d30ccfd815d660f6362
font_04_sfnt_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 16256 bytes
SHA-256: d9b6788e98d720ed34e7048aeb7a337db0b6f87b8f940ce258886e614f67cbc8
font_05_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 1736 bytes
SHA-256: 551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960

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