Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff696ee53bbff48…

MALICIOUS

PDF

88.7 KB Created: 2021-07-20 04:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dc491e90b53a2004c24bb23b1ef58929 SHA-1: 7ff1553498de72410382900ffc6756e3cd85eb25 SHA-256: dff696ee53bbff486b211d6d2d9122bfaae680304d1999bd3037b2a9dfe42ae5
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains. These links likely lead to the download of further malicious content, such as the PDF itself or other payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1022ccaa---retixabojerujuf.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e03a5b5513a97138322fe29615215c74/25310341969.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607735cfb168a---sozupumifuweduxifalex.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/63080254600.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xasuperoxipadasopom.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf698ea51---60700218008.pdfPDF link annotation
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9e005a80c2cd3a6ac76edeaef2eae4ea/25335065827.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/dofogulij.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/58g166986oht1f4v5vfv85lsbr/20384258137.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1625429874.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e385c71658---89244285293.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/silubu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/woxasufikedezatet.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf98cfe6---kutuvetufisukaz.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/31887244645.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/80652341131.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896d556ddf3---pobedal.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1b8ac86d645fa44122fafc568c730d3/73367522841.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/piges.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/dezexulipugobowowok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=noun+clause+and+its+typesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 18124 bytes
SHA-256: fd0f39a6c5ca3a4d488715d968a97823dd63b8364bee0aae17c2bcd30c0e8d2b
font_01_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 10600 bytes
SHA-256: e5d9c49903ac74532b657de3f41b8c37a0b0b419890bda2dc67509097d2308d6
font_02_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 17096 bytes
SHA-256: c4b5987dc92be1462560beeed86c28ab6a0a42f6a594361c3805c879e21d8a10
font_03_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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