PDF malware analysis — malicious · 5de16d1df4210208

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 17:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d947054add43574f44dd395813659a06 SHA-1: b9d895d1a361c225ba8d47f3ee6aee3a048b6353 SHA-256: 5de16d1df4210208289ca96d9808c7ca8d519287d689b5e7b6823cf0fff6f52f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely to obscure the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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://smidgel.ru/uplcv?utm_term=is+it+possible+to+unlock+phone+without+losing+data PDF link annotation
- https://giolog.biz/images/bulk_images/files/jirugik.pdfIn PDF document text
- http://nwatchonline.com/userfiles/file/76216731245.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2bc7c5ee0aa9cd71708259fdad9c1b5a/52812455249.pdfIn PDF document text
- http://chiron-ventures.com/chiron/home/img/upload/files/2109030603424748725en6a.pdfIn PDF document text
- http://siamintertrade.com/file_media/file_image/file/tozuxabofuxugen.pdfIn PDF document text
- https://sibois.eu/userfiles/file/piruboja.pdfIn PDF document text
- http://hataylezzeti.com/resimler/files/vejogekuvanusaniv.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5722b0945c5fbc5273dcc886293823f2/zivosebowevisifute.pdfIn PDF document text
- https://cs-nippon-cp.com/mailmagazine/upload/files/45809447609.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161306c040f579---86925921848.pdfIn PDF document text
- https://tttinox.com/upload/userfiles/files/xozapoxagipudirusoz.pdfIn PDF document text
- https://wroclawmodelshow.pl/ckfinder/userfiles/files/6739261306.pdfIn PDF document text
- https://allegypttours.net/userfiles/files/tubaradugavupusigopese.pdfIn PDF document text
- http://abwcockeysville.com/uploads/files/13285756368.pdfIn PDF document text
- http://netmutum.com/userfiles/file/xutitubinuxa.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c11caba75b1ae3986ebc76a47141dd93/55454913162.pdfIn PDF document text
- http://agierresrl.it/userfiles/files/1719179175.pdfIn PDF document text
- http://knupress.com/pds/editor/file/semidi.pdfIn PDF document text
- https://www.karelo.com/uploads/File/pobagesizazipog.pdfIn PDF document text
- http://yusungchart.com/userData/board/file/46999449908.pdfIn PDF document text
- http://chinasoftcore.com/userfiles/file///suxejeni.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/kibavedigofagidogabuso.pdfIn PDF document text
- http://martonaroniskola.net/userfiles/file/mosokesuzevenunar.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/31684006689.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000eb08.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xEB08	17468 bytes
SHA-256: `9e4af6ea45fe4cefccfca24ce51c0a103884ef3d7af16109ccc3d2d4e5d49794`
`font_00_sfnt_off0000be00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE00	17568 bytes
SHA-256: `3e4164a390d224ff2ade5072766df24234996dcbbdb8024b6057be72427c071b`
`font_02_sfnt_off00010575.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10575	11064 bytes
SHA-256: `2d8ff9d074c440634eee5dd2ac24420b766a08c6b0176dbe7f8c5734140ef90e`
`font_03_sfnt_off00011ed1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ED1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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