PDF malware analysis — malicious · 3d2f34ea514efe9d

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 03:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 42bf1d6122a4436ecb2537df46373ef8 SHA-1: c5a3568da0f96c11379d4a37a58a1c8a66d73a5f SHA-256: 3d2f34ea514efe9d802901f714b9dac90f2795321e14f185ef43bfb59ed1ac0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://bighost.vn/uploads/userfiles/file/sasoxufiduwuxirabapidoxaf.pdf In PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/tvfr2cfr1nqri345m6ik6cfq2i/rulavokusugapoduburewo.pdfIn PDF document text
- https://botroul.be/uploads/45350228192.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8b4bfde0375a0b7f3af9d7f770c30e94/11819433867.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/33c7dfae5a7c4354e997516d7c940064/lapagexatigaxuxaj.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce2e17abd---92789026470.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c671b98e3---96123978497.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0e53ecf13400b7f593dd2bae94cc2b06/43002771752.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b6b655abcb551c6eadafc203a4d4659a/gegokor.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b1597a53---33032032066.pdfIn PDF document text
- http://keigan-productions.com/clients/863431/File/58416269242.pdfIn PDF document text
- http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/56486352181.pdfIn PDF document text
- https://mfdesign.hu/files/file/32717173050.pdfIn PDF document text
- http://rungrawin-itt.com/userfiles/files/65260430603.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdb0e7182---bilodivi.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rr79bc7mcjan2c8og7p3ur9r4m/89402134836.pdfIn PDF document text
- http://cauthinh.com/luutru/files/fivipimerada.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4691cdb2da9aa21619d379264c7a6eda/dojenasawufegavovalixemi.pdfIn PDF document text
- https://jeanmarcrobion.fr/userfiles/file/zutatugezupemusi.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102faa7d5d43---71649434447.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf84aa773d---33158285334.pdfIn PDF document text
- https://europartner2.pl/uploads/tibixanidubixiv.pdfIn PDF document text
- http://www.look4job.gr/images/_user_na/file/vuzom.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=learn+french+book+pdf+freePDF link annotation
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e85baaca0d0701f486ca9f01947ee345/noguxudukega.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433c82ba65---53211543658.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA92	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f2a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2A4	17964 bytes
SHA-256: `a7eb9135651fb916b604906b5090b8ee570d258c71bc9719920bfa8d5590002b`
`font_02_sfnt_off00012191.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12191	10500 bytes
SHA-256: `b1a55d0b5c355b6193ead4a7041abc990777baffe32f60b8bfa36f848d4d1992`

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