PDF malware analysis — malicious · b949aaf4ffc7687f

MALICIOUS

PDF

91.0 KB Created: 2021-08-12 07:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 17c0322419c0110905eb38dfc61185b9 SHA-1: 36f4699d1ccf55a8cdaf78449a1b7e78aeef686a SHA-256: b949aaf4ffc7687f224271b83c806a589327c2ae275cf7551b74a7e186c1818b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS upload storage and forming link farms, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

Heuristics 6

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 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://allytemp.ru/uplcv?utm_term=vidmate+apk+ios+apkpure PDF link annotation
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59e1630f0---sekigezoxavijaronusata.pdfIn PDF document text
- http://passaicvalleyclassof1957.com/clients/44362/File/40094324566.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/08348488738db29595ac548cdb7a9ae7/67956696764.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b773b22931f---26692027757.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dcfeb5a7---bewawakegaremane.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/jurinorubagobanaduraf.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45527f24d8---98409001953.pdfIn PDF document text
- http://polyalpan.hu/_user/file/pivako.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ieukjsqdt9gv4orpcsvvvd7h1/jirujijodatinidabonep.pdfIn PDF document text
- http://anapro.com/ckfinder/userfiles/files/38704295678.pdfIn PDF document text
- http://bogelaipigeon.com/upload/file/womenasupubo.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091a688ac3e5---megegikuxodajiweduzitasel.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bacpjpfhl99u2n2vfqviqpo8g0/tuxezurodugajiz.pdfIn PDF document text
- http://skybuildinfraprojects.com/uploads/wevufawogujivaxifawa.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd766aaf2---69286302869.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdab64a81c4---61519248985.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/waliwezabalozof.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5aoh1ekh5lis5bva3782c502oa/92830554505.pdfIn PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/85455437380.pdfIn PDF document text
- https://houstoncoinshow.org/FCKeditor/file/weruxegivefop.pdfIn PDF document text
- http://petrduchek.com/files/3244457658.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/97359640060.pdfIn PDF document text
- https://parfumzone.ro/files/file/9153461600.pdfIn PDF document text
- http://hjtech.org/admin/upfile/file/5640217399.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca09289419---popixakudodugofuni.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f2d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D8	10564 bytes
SHA-256: `30ef51e7a81b2c0897e6757a6dcf57be0a2e1da44583906ab3e6696bc2bde7f2`
`font_01_sfnt_off00010af6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF6	1824 bytes
SHA-256: `df35cb05b954d2eee8b11b2756666eb15b0d4e27582203a20e31cca7290f1dd0`
`font_02_sfnt_off00011382.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11382	18412 bytes
SHA-256: `ee5c542633f1ead0d4ed533515d352441fd51d98e9ad3902ff166b96a6af6baa`
`font_03_sfnt_off000143d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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