PDF malware analysis — malicious · e69b5d70480e0a27

MALICIOUS

PDF

90.5 KB Created: 2021-09-07 23:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5629c6db9624f51bec4a41d25cea7fe0 SHA-1: a2ab2c11c487d4e6e4df63ee4a2a253545e28a13 SHA-256: e69b5d70480e0a273b9292ff6e168f4ac42cfe87ea88ec6750842cf478de2a3d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lead users to potentially harmful content, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

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://thenikharvconsultancy.com/userfiles/file/91997990872.pdf In PDF document text
- https://dtd.com.pk/ckfinder/userfiles/files/81955736379.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cs1trbf2bb4a9c4oruafd7i6e7/29418833160.pdfIn PDF document text
- https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zadatejazojifediw.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2354f8e5---85689806137.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baebe86170b---41253557.pdfIn PDF document text
- http://rosabaum.de/web/editor/files/puxojonorez.pdfIn PDF document text
- http://sushi-belovo.ru/files/nijitawat.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e602a971a---40559218298.pdfIn PDF document text
- http://nacyc.jp/Upload/file/vixuludo.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb2449c---gegadamifasewud.pdfIn PDF document text
- http://studiomarcheluzzo.it/userfiles/files/piwizazukepafujilimapev.pdfIn PDF document text
- https://dbmotorbrokers.com/userfiles/file/82020205712.pdfIn PDF document text
- https://essuances.com/ckfinder/userfiles/files/vapeku.pdfIn PDF document text
- http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/79655814315.pdfIn PDF document text
- http://abwsalisbury.com/uploads/files/11667477672.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/25711616197.pdfIn PDF document text
- http://achwvs.love-mrt.com/upload/files/29054153324.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612e978ca42f6---livapubatenesebawipafeme.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092972f6d45d---diriv.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qh8p9i1ki6nejmfk5gbj6cbg52/lowutajazezomojinozugi.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607506dd07414---9822655451.pdfIn PDF document text
- https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76b8f9ccd133a47d357fc1f0a1d2cdae/43162768289.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/lalefedupoviwaf.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chemistry+lab+manual+class+12+salt+analysisPDF 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_off0000f81e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF81E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011035.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11035	10932 bytes
SHA-256: `bab21ba0f5369a990d8706725f339f4b84d90fd2dc0779cad386485aa4f41d01`
`font_02_sfnt_off00012975.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12975	19296 bytes
SHA-256: `4e863454bd140ee37c8388fa08e5db8fdbac9369e6c74a292a1e2884fd064362`

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