PDF malware analysis — malicious · 9593e02a92d49837

MALICIOUS

PDF

82.1 KB Created: 2021-07-13 09:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a953d9f399e2dd243658c1bfecff583e SHA-1: e27303a502dd3818fee39c1d5a3cdec56bd6e6e7 SHA-256: 9593e02a92d49837cc5375ef47211fa59a72506337aa9d49402000a0dafaa9f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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=8th+grade+english+worksheets+with+answer+key PDF link annotation
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lvub58otq07fv3eh1ufrepvnln/22988077108.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3e4cd7dd2cd886991e59af838e5833a5/42655954609.pdfIn PDF document text
- http://ztkammer.at/uploads/file/18104761242.pdfIn PDF document text
- http://kme-kme.cz/files/file/sowujipiturokasubixa.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jsub0ep5vbebdcas4r55kv32r6/wesuwa.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca9ba2a18---14266617276.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bdbc495c---maxesed.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e867c9b48---42283391750.pdfIn PDF document text
- http://maroba-zirndorf.de/file/dibomoxodudaraxide.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f857893c83---madam.pdfIn PDF document text
- https://le27.fr/docs/file/kafarotituwuxofilerumomuz.pdfIn PDF document text
- https://creteotels.gr/FCKeditor/userimages/file/94377199137.pdfIn PDF document text
- http://moscowprice.com/content/xuploadimages/file/nirofaxotokupojaf.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/77dc47290e1daddc9e20f1c839bfd6bf/15202748424.pdfIn PDF document text
- http://www.vikingmaterials.com/img/zawurinixotajutujud.pdfIn PDF document text
- https://arzhosting.com/calisma2/files/uploads/62052536340.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_off0000dc3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC3E	10932 bytes
SHA-256: `28d432075acdb51c643fdc8e49e19dd5d7ca1c9078166b5da185022724601262`
`font_01_sfnt_off0000f56a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF56A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D7C	17744 bytes
SHA-256: `e06278d51d4494fe8c696eda9a41b016a602d11cef038356bdf293f8349f8fcd`

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