PDF malware analysis — malicious · 56c84f4e2d9d094b

MALICIOUS

PDF

107.3 KB Created: 2021-07-13 21:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 40b530bda3b60886a515ad2984c6fbac SHA-1: 1ac2bc7abe33e3f1b5cf6617710c15a01ce4b8ad SHA-256: 56c84f4e2d9d094b8e0290dec35f1d8feaef4898e0456f6d44cce0bc9abdd26b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware distribution. No scripts were extracted from this sample, but the overall structure and URL patterns indicate a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=james+parkinson+essay+on+the+shaking+palsy PDF link annotation
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edaa946b67b---24452737225.pdfIn PDF document text
- https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6017b561e8a49db2b81862bc5a365984/25431743423.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/10f745997554fbb1dc956d03925d28c6/82570407274.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/26787966ea1bb260b05f2a4219c56ab3/dotujegabef.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb089eb606---womuruxuniboxigifafaj.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bf3769b854205e1120807ab898192e7a/turowud.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jl71hhialsbbq2jvoedfek4l77/kisutonedoxagosara.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kn80u2q9qi9s8bde0dg8cfukcc/xorukugutukejiwuwev.pdfIn PDF document text
- http://ruoumoc.com/upload/files/vogisewurox.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f74438c---jisojuvuzetusadixadodeke.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9si6qk6d53satipluso7405dca/67190365959.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc397fbe6---pilotesuponapedizudedanew.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/26929821288.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/vidinuvogarusoxavijemu.pdfIn PDF document text
- https://soalmatematik.com/userfiles/file/govomepunix.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/36667018571.pdfIn PDF document text
- https://flyags.com/editorResources/file///62938010256.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b0c8456c---66483132118.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe540dd19---68263285908.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/63363837632.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e275a21b6---9182102018.pdfIn PDF document text
- https://nazrabilisim.com/calisma2/files/uploads/nefamukapitirago.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16071441b361dd---44604024708.pdfIn PDF document text
- https://dvg.asia/ckfinder/uploadfiles/files/samifak.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/dajuwepeb.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_off00013e23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E23	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001563a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1563A	10896 bytes
SHA-256: `d2de5990fdd1f5f463817b659305a91df365117cb6707efa6315d641825b4893`
`font_02_sfnt_off00016f42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16F42	17880 bytes
SHA-256: `707a0fe86e61e28a8246a2662e153289e10e73839647ea7ed4224cfaa4a0030a`

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