PDF malware analysis — malicious · b99f1a71d559fc2b

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 01:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: b0dd02930bf038e9b9c409b381a7ef2d SHA-1: dee031511c022e60d6734a1d1214ec137a17a104 SHA-256: b99f1a71d559fc2b0354ba7fe968b73d81ac190a926c2a4d7a286b4f7ac0cdd8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a34e3bb4c758676e3f8032704c09d06b/nivimeronizevedog.pdf In PDF document text
- https://noihoithanhtuan.com/media/ftp/file/39625723288.pdfIn PDF document text
- http://ulrike-mayer.de/userfiles/files/52807443294.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff14a0acd3---xakomawamuxid.pdfIn PDF document text
- https://dzido.pl/userfiles/file/17289299389.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8cf02c4f49228019604178e95f2e580c/87598587135.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/160e86ed7519f3240b5a5a205dcdb9b3/20632654209.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc188cef0---70687529361.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4290e9f9---wuborozekakivisafetij.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/44463206590.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607990e2d829c---purudegasat.pdfIn PDF document text
- http://baobiachau.com/luutru/files/dadokafel.pdfIn PDF document text
- https://lwim-ouargla.dz/ar/files/91891197398.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da122aecb---texawosowimijemuxajumu.pdfIn PDF document text
- https://sharenkon.com/files/jajopasenukolevugimu.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4ooh458vn3fji6un2kqrmtjtdv/76658067201.pdfIn PDF document text
- http://andlupa.com/userfiles/file/wupumituvametalikivasidak.pdfIn PDF document text
- https://fokusmedia.com/images/uploads/kuzujogobirelajurejewixel.pdfIn PDF document text
- https://zemiigori.com/uploads/file/77142524259.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d61434a99b1---lilunisitijazesafutulub.pdfIn PDF document text
- https://echipamente-scule.ro/userfiles/file/74480859237.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/49d911eb254a863b932c23f543b56c67/vimuresasazosujisijofo.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4502edf8a47f8185ad94458b1a082322/kazuguvulubajivetaja.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/vajadogigipusefisabojonog.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5elre5mg2oraeplalvnrcodsk1/70277398011.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rylands+v+fletcher+case+pdfPDF 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_off0000e94d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE94D	10728 bytes
SHA-256: `375529fb544c193eb1b8092467793016ba3021a0680b75bc07a7ff7d47b6b6f3`
`font_01_sfnt_off000101f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101F4	17768 bytes
SHA-256: `cc9d9ea8125a9ea82e5b7fc33ac70c6ac42a31622913341c056874ff5707a682`
`font_02_sfnt_off00012f4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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