PDF malware analysis — malicious · 5c59dab36003a161

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 23:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d8eba27138cfa1d48e879f103c931e05 SHA-1: dbaffa26e90d14ee376452aefc3e31be3fba37e0 SHA-256: 5c59dab36003a161537004a7a5c397f74e1e929be963e350ab583daa4f03fcc5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://crewmak.ru/uplcv?utm_term=subnetting+quiz+pdf PDF link annotation
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795b4d954a---94998597488.pdfIn PDF document text
- https://makiriaszto.hu/ckfinder/userfiles/files/48168541144.pdfIn PDF document text
- https://lacecinella.com/writable/public/userfiles/file/tetamoredexezotomedijeg.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/79251177918.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943608995af---gokakuwujotexifu.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8e483cc5---pukukimedalimelidi.pdfIn PDF document text
- http://ticketsperiodico.com/galeria/files/gudakik.pdfIn PDF document text
- https://www.informacion-indoorclub.com/boletines/img/file/43759462494.pdfIn PDF document text
- http://auroraenergyproject.it/userfiles/files/jovoto.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/84626308173.pdfIn PDF document text
- http://sonnenheizung.ch/fckeditor/editor/images/file/taberupalise.pdfIn PDF document text
- http://goldenpoolandsauna.com/user_img/files/tinunelefiwetozamuf.pdfIn PDF document text
- https://norservis.cz/files/files/304875706.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/46b5b592311c946d882f18ce49d0d9d1/27376331080.pdfIn PDF document text
- http://topas.lt/userfiles/file/denajix.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/270432d1ea2ca4588af8c8346470b157/46617573858.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/f1up85974hn3qss37d2k6qnojc/nusebuvozixigozogegolazow.pdfIn PDF document text
- http://www.gulbaharsigorta.com/contentData/file/4333169563.pdfIn PDF document text
- https://limsurdua.com/contents//files/kemexuroxikuresoketib.pdfIn PDF document text
- http://e-motyle.natura2000.pl/imgturysta/files/45146120193.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524aa2e44a---42084977859.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b14d16d83---guxazekadume.pdfIn PDF document text
- http://patriabrno.cz/userfiles/files/telegagetawekituj.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111c25d4279d---xapalokaviwasejegizezonuf.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c201c19---55799984228.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd0e82683---wediletojekoruratiretarex.pdfIn PDF document text
- http://dienmaythanglong.org/uploads/files/15745193016.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_off0000c26c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC26C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA7E	16748 bytes
SHA-256: `47975e8f99c7ab41965c923b0081c3134c21230e9d67b9abd0353cceb854c5f3`
`font_02_sfnt_off0001059b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1059B	10596 bytes
SHA-256: `7318c5ab559c377030a9743c5dca629d347fc3d7ae0b4019c562f3843b66577d`

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