PDF malware analysis — malicious · 722fda51fbb5cd95

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 12:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d1091c36dcb6224f5cbd54b0a4a7c4ba SHA-1: 21c6460520619e18e00d3bcd25a70ff4dbb267f6 SHA-256: 722fda51fbb5cd9538b9b40735e49fe12eb0308b66dc93861bb2ade2105d1316

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The document body was not readable, but the presence of many external links on potentially compromised hosting is a strong indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9045689ee343003ca4d2f3f7edaeeaa2/2622480057.pdf In PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09675f1a20---7253305179.pdfIn PDF document text
- http://joyear.com/ckfinder/userfiles/files/vifozuwenesoxarizajade.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/5062664835.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1fec973f332aed01c62e3b7ba55a921a/tujodixesan.pdfIn PDF document text
- https://betenagro.com/sites/default/files/file/nizajujerawewiwoxalaxoso.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacd1b4491---56315761298.pdfIn PDF document text
- http://jjinline.org/file_upload/file/runalerot.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/42181227475.pdfIn PDF document text
- http://candientushinko.com/images/file/wuvevixado.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e985f0eb0---wuwesimol.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59bcae61c---39080457201.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/37807328622.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7183f6b67cbb7fa1c0351c0bb8af8855/15461811475.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/69312456637.pdfIn PDF document text
- http://rivebistro.net/ckfinder/userfiles/files/gesufen.pdfIn PDF document text
- http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/58905548041.pdfIn PDF document text
- http://vizugy.hu/uploads/files/41114964151.pdfIn PDF document text
- http://gitishahjahanpur.org/ckfinder/userfiles/files/1713640968.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/08514c6d1274f3a66c18381886f0b2ea/98580357446.pdfIn PDF document text
- http://market-oborudovanie.ru/upload/file/18553510800.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160987d6a7877c---bofegoniverivamob.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b242df853b444242b32fb1038031450a/95502124934.pdfIn PDF document text
- https://bkht.vn/userfiles/file/55051281873.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd07eb88e---nudutusaxogam.pdfIn PDF document text
- http://thuexe7cho.vn/upload/files/fatubat.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=guided+access+on+ipad+not+workingPDF 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_off0000ea08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA08	10960 bytes
SHA-256: `4cb39c0919f06c2ddd82d91584f43f52d93ec09370dd506550b2d833dcc4038e`
`font_01_sfnt_off0001037b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1037B	17596 bytes
SHA-256: `2b9ad9cac62f70507f642ec0736110ad50f856820b2dda22b9fd006f7595b1cf`
`font_02_sfnt_off000131fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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