PDF malware analysis — malicious · 13c06ced97e061ea

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 23:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8ec35ba22a2b75b1af99ca2c27b9ccd2 SHA-1: 329cc99984ed87aa118e3cc0697b500f2902bf3a SHA-256: 13c06ced97e061ea229552454b1617624e66b8b4f9ad1dc36046f0175b3e24f7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to compromised websites, identified by heuristics as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4433393461c12276f973da82acf8bf49/zekiferotogaba.pdf In PDF document text
- http://kiuanai.com/userfiles/file/fesigebiwozebazupewe.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934867e6f7d---kepedolawesakovana.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d69b3833c9cd756dbe844e2ed3913b61/24281756585.pdfIn PDF document text
- http://abw10thstreetne.com/uploads/files/zalum.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9eaaf2cd---40934735935.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa06738a9---xovofuzofunogepuseziza.pdfIn PDF document text
- http://maszyny.pl/userfiles/file/rasabepidewafiwavatoreme.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0d0ccd19---sibejapibejuvekevejaf.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5d8eea8b94---54002160871.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095459a26c53---kekitesemobesijiwetoxa.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832dbfcfde7---9602465901.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e3696f5c14522bf2279dff7639bc98e8/zunodipugojiruborarevuruj.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pksp39mfkihntgh68nc68dk2oe/67275976888.pdfIn PDF document text
- http://elm3rad.com/file/97219447687.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8995e5e177---1801183022.pdfIn PDF document text
- http://bioscipublisher.com/files/upfiles/file/xugifipivodefaw.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16ef04450---79337251790.pdfIn PDF document text
- https://triosms.com/userfiles/file/bafizoroguxiwufixupobux.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/65fdebe08ebc27bcabbeb16a81022652/zipimov.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a021828b2---76931169306.pdfIn PDF document text
- https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a53bff843b88b79345e9c19c756f89a2/39094616887.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2bc3697bc95789c916de89bfdba1717a/jalefejadupid.pdfIn PDF document text
- http://liyangah.com/Upload/file/kaxiliweg.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/70bedhe49o132ufsttho9an987/70939111075.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609af56d36a29---jesabegaxakeso.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210617_074851.pdfIn PDF document text
- http://thegioidahoacuong.com/uploads/image/files/rorekuwopojobuvakolisa.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=use+sinew+in+a+sentencePDF 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_off0000f756.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF756	18420 bytes
SHA-256: `5902b2390c3c6508be043cad5311e7a6ee65bb75b47269596675b0794a9e4e99`
`font_01_sfnt_off00012720.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12720	10048 bytes
SHA-256: `68aace555f81d1480e872731b6c8a3f71401f7675ec1369ceb57a92cbca1aa99`
`font_02_sfnt_off00013dae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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