PDF malware analysis — malicious · 870e72c5750294b6

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 04:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 61e3be730037950f09fb3c256d072111 SHA-1: f62655e43f86483c9cc96c6e78666729f9fb45e9 SHA-256: 870e72c5750294b693c878b6aa83297e3f6d2125eca9eb7aaaa8d0638d3362c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. While no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/aeecbd2dd0ecb0d5dd055eb8779cfcb1/dabam.pdf In PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a46e8dd930---10385972852.pdfIn PDF document text
- https://jxlmedu.com/file/files/20210802_144520.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ff751068---86679944333.pdfIn PDF document text
- http://opuspoint.com/ckfinder/userfiles/files/37796133705.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b75505ec1e---logifigubini.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2a18158e6edbb5fc0bd1a6a683d81e55/rodaxanelufexopat.pdfIn PDF document text
- http://brixtontaxi.com/survey/userfiles/files/vomepozegipubiruluwepe.pdfIn PDF document text
- http://xiaohecollege.com/d/files/bipelubizodoxozawipob.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-8-19/20210819212852616642.pdfIn PDF document text
- https://tasivn.com/upload/ck/files/72126879624.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/02949954c9024d9a371864df2dfb66be/xovamanakidaluxezo.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/98211071002.pdfIn PDF document text
- http://stellamaris.cz/userfiles/faretetuvifusakaju.pdfIn PDF document text
- http://18554080.com/userfiles/file/25083975266.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16118f3077daf8---68187624356.pdfIn PDF document text
- http://creaorganization.com/depo/sayfaresim/file/62971193558.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ns1n7fjgjumn7c0n3hi6826tl4/12604520754.pdfIn PDF document text
- http://diplomat2014.ru/ckfinder/userfiles/files/17927611758.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506e33dc1d---6506768117.pdfIn PDF document text
- https://www.weldcor.ca/public/ckfinder/userfiles/files/ladujufadu.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d7c74869---33065426509.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099537e7f1a6---kutumipomogeweferavejij.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/225b935014ecc1efe68bf174d4b8b38a/61089398426.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/pafani.pdfIn PDF document text
- http://banphimchuot.com/userfiles/file/7772457649.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=diamox+altitude+sickness+pdfPDF 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_off0000dc00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC00	17812 bytes
SHA-256: `cd2b285fa6292922f4865afb10a404c0f8ca0284fc7c096ee2fffee32147be03`
`font_01_sfnt_off000109d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109D7	10976 bytes
SHA-256: `81c6635049e9b6054afcde3fe01ba9e5497af7f133bdedadf7bc7621fbe2c888`
`font_02_sfnt_off00012357.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12357	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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