PDF malware analysis — malicious · ef091d703b93f00d

MALICIOUS

PDF

72.5 KB Created: 2021-09-14 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b497a1d75550d167153c026f5ccf47ea SHA-1: c5b3a073088a8d69aa5dc162be6958682aeb1be3 SHA-256: ef091d703b93f00d3f4f42e3c17230ab3acaa0a942b61f3b00cebc25ba70f76d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://chcial.ru/uplcv?utm_term=copy+paste+text+art PDF link annotation
- http://baloneacessorios.com/_upload/file///velikajegirudi.pdfIn PDF document text
- https://fotoprint.lv/downloads/file/wokufenuwoxizapajigafoj.pdfIn PDF document text
- https://chiataiec.com/userfiles/Proj_Name/files/15578526032.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/29021567857.pdfIn PDF document text
- http://romovi.net/sgi_userfiles/userfiles/files/zemibenalowufuja.pdfIn PDF document text
- https://sarenpinler.com/calisma2/files/uploads/luginuja.pdfIn PDF document text
- http://thesei.com/In PDF document text
- http://makesomenoise.hu/upload/file/46482116046.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/715c44f46ee579ac703cb45ad1e56f05/80577282895.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306963ecc40---rekonumefuketalafigowor.pdfIn PDF document text
- https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rofonomoserofex.pdfIn PDF document text
- https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/noguga.pdfIn PDF document text
- http://emaaravm.net/upload/files/xalarulujugipetolovas.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7893960---zosojomenubukilerap.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/janoliwugavujepiloridez.pdfIn PDF document text
- https://e-casainteligenta.ro/userfiles/file/xoxobuzobabaxozarupudo.pdfIn PDF document text
- http://quranday.org/userfiles/file/kimatuba.pdfIn PDF document text
- https://www.alitec.es/js/ckfinder/userfiles/files/49998483704.pdfIn PDF document text
- http://aliguoriarchitetto.eu/userfiles/files/topomaw.pdfIn PDF document text
- http://weighlessthisyear.com/ckfinder/userfiles/files/fafaxesaxanagotapanugebo.pdfIn PDF document text
- http://dsfly.com/uploads/files/74430866290.pdfIn PDF document text
- http://autowassenindex.nl/images/uploads/fozit.pdfIn PDF document text
- http://bunny888.com/ckfinder/userfiles/files/35522203272.pdfIn PDF document text
- http://nuitsdartistes.eu/images/file/firakiv.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/wimuzipabiterupejubuf.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_off0000b443.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB443	10252 bytes
SHA-256: `84e15718a32c8cc364ae17eb09a72a64cdffd84bbf686d886bc4887d5a0bb244`
`font_01_sfnt_off0000cb86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e398.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE398	18964 bytes
SHA-256: `abd42251439a176c417affe435157da66da7b698f71bf970de3247779da978f6`

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