PDF malware analysis — malicious · 82e75903c26dbc34

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 16:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4ebd43df6a0fbb9c1ce5cbc83bd8bb38 SHA-1: e79acf4aefbafd7b303dc7c851fb8959c8fe160f SHA-256: 82e75903c26dbc341845f0662923d1da4b202f4327d36f9cb6f69e5c5adf6a74

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6b0edcefe077b28ac03211585ac5730c/50456236802.pdf In PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7jn6hggs0hb4s286b30sbgap4k/xaxexowemineloripel.pdfIn PDF document text
- http://studioriboldi.eu/userfiles/files/peputijanevuwoder.pdfIn PDF document text
- http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6bf1cdc7cbb24275d51b94d62cddbd1e/67131633052.pdfIn PDF document text
- http://abpjse.news-read.com/upload/files/80909699220.pdfIn PDF document text
- http://oishisushigd.com/uploads/files/10143580993.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8151855047---35609358201.pdfIn PDF document text
- https://culturasiapamplona.com/guiarte_userfiles/files/55573663499.pdfIn PDF document text
- http://wellfoto.cz/pictures/files/56851846085.pdfIn PDF document text
- https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/defowi.pdfIn PDF document text
- https://yucekalipmakina.com/tsrm1/img/userfiles/file/kopokixofewepabapajexumip.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64d6e6af4a003834ba7fe16a2b0d0621/gepuvukifebevidubovurugex.pdfIn PDF document text
- http://autavrabek.cz/obrazky/file/xugixosigobesoxuni.pdfIn PDF document text
- http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/74588848762.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/64942891564.pdfIn PDF document text
- https://samavetah.com/ckfinder/userfiles/files/vemiwofirilopaxef.pdfIn PDF document text
- http://dienmaythanglong.org/uploads/files/47483992791.pdfIn PDF document text
- http://iswii.net/ckfinder/userfiles/files/lalirijosuvajokipit.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/15097644314.pdfIn PDF document text
- http://jatyn.cn/upfiles/202108/file/1628695807.pdfIn PDF document text
- http://platcometals.com/images/file/gobivo.pdfIn PDF document text
- http://ongnuocdenhat.com/upload/files/22879414143.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/84451193135.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824bcc0a206---7996192442.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=split+pdf+to+smaller+filesPDF 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_off0000d899.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD899	10628 bytes
SHA-256: `870336bb540d9df2a50f07f55c952ae10cffcdb92b8e688b01792513e1476885`
`font_01_sfnt_off0000f0e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000108f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F3	18140 bytes
SHA-256: `db9b8425740a43acc61c850f176d786a389ecdcab06ba8f112bf229e8f5e0168`

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