PDF malware analysis — malicious · 12933e0c49059540

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 09:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ab86fb89abed4d09f85168022cff8601 SHA-1: fb5c860a567463aecb13042652188068e51713d4 SHA-256: 12933e0c4905954039324160e312003b2b28cf63f4b97f90440341fd9f44483b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://urduhadith.org/survey/userfiles/files/jejizi.pdf In PDF document text
- http://beachfirebrands.com/userfiles/file/79631237713.pdfIn PDF document text
- https://marbeyoyun.com/calisma2/files/uploads/11427094567.pdfIn PDF document text
- https://dpt-mh.com/uploads/news/files/juleb.pdfIn PDF document text
- http://www.darvidproperty.com/news/file/wobobivirerudusedoma.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/saxenowumopi.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098456b609e5---9681511890.pdfIn PDF document text
- https://swift-tw.com/lcc/upload/files/jawikufibe.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ba1743bc---95311275584.pdfIn PDF document text
- http://csc-vietnam.vn/uploads/userfiles/file/zapisisusexoginu.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cc1b31---17646185610.pdfIn PDF document text
- http://namuvaldymas.lt/userfiles/file/42476421663.pdfIn PDF document text
- http://flagrant-desir.com/userfiles/file/27460086552.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/babo9ji5ld66u2irdmbsidvvus/47047775500.pdfIn PDF document text
- http://artospace.com/pics/file/kibupotafuvowonedipe.pdfIn PDF document text
- https://shinaltd.ru/images/file/xeburujekat.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdfIn PDF document text
- http://kleiberit.ru/files/file/nibuwaribovav.pdfIn PDF document text
- https://southafricapools.com/contents//files/30487605763.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ccf29011---8894890449.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d006d2521---bomesadabexun.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07cff05ca---80792032370.pdfIn PDF document text
- https://jmcoverseaspvtltd.com/uploads/files/kepoxi.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abd02e76b2f---tagibofal.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/17762841631.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edc416c89b---kujojowuweg.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed6558fbbe---89777369797.pdfIn PDF document text
- http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75bb638cc---31064300523.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=law+school+letter+of+recommendation+from+employerPDF 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_off0000eb62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB62	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010379.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10379	11044 bytes
SHA-256: `1f32ea0edaa2576b6c83656fda6df9601daea411f105f2ffd474643bce2ea613`
`font_02_sfnt_off00011d0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D0F	16816 bytes
SHA-256: `5567639cc6bfe3c658aa2a830aeda2273de43697d508d26db2f8038e535a1d3f`

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