PDF malware analysis — malicious · d52c6e813b45cd5b

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 23:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 91b16dd23b0edda40ec2c7424f3d7a4c SHA-1: a0be369672c1328c6941c66adc186bb3120961e3 SHA-256: d52c6e813b45cd5b0c3259e35971e0692f7db348ff67bfcf34a0ef9ada9c4168

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links, many with UTM parameters, suggests an attempt to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://minhledtran.com/luutru/files/36201067365.pdf In PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/44516587903.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb516cec23---2298796121.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2d3smnhagublnhkqs3ec28j21o/97198417545.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07c178670---xelowazizififisupifakoti.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f6e4c6bcc37cc19f76a20373b121aeee/zabujewiwo.pdfIn PDF document text
- https://mangonebike.com/uploads/file/miwevi.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb30fda265---zakub.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d1cf99789236ee32b05b87be37268571/11593242863.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdfIn PDF document text
- http://extracam.es/app/webroot/arxius/file/8283437184.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baad5e66f53---28619917869.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a96b196d59bf0d1a705274e35afe8c9e/bemixegap.pdfIn PDF document text
- http://polyacer-ecp.com/userfiles/files/20210704_053702.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d9a39271---wizerotedudubagolegixito.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849539a2a2.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/bijofoluzuzexamuzubof.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffede9268f---50416990598.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4ca311c95603fac1c2b2339e056878aa/86976895030.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876225a9a2---vesuji.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/12415288788.pdfIn PDF document text
- http://sushi-belovo.ru/files/15192100536.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/3445932043.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080964978e95---pivazenululevalogofubib.pdfIn PDF document text
- http://agro-partner.com/Image/files/mupitimurelinimulev.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/jelodalatewixeminosug.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9095dbd10---78450671357.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=residual+value+of+an+assetPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fb39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB39	17384 bytes
SHA-256: `295ad4f249c9b3df4d7eac0eff439c065971b9ae534bfd346de1c0e7b1b6a8f8`
`font_01_sfnt_off000128c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000140de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140DE	10456 bytes
SHA-256: `2d090ef5b1cee83256e096d58127f14334ed4a33fe71a0cee1f2f9ea906b45e9`

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