PDF malware analysis — malicious · 266c7f42c5fdec97

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 03:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: fdd7ecece9461fb1acf5c1a799c58f69 SHA-1: 77771a92e77686f9909a8fb86ed868045aab1f76 SHA-256: 266c7f42c5fdec97b2848e003e729da59d0f8de670ea8e1c4b0ee63d84e2f455

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or utilize SEO poisoning tactics to lure victims. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or further malware. No scripts were extracted, but the presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://etcpremium.com/userfiles/files/36949287331.pdf In PDF document text
- http://www.pacautomarketing.com/file/nanogizanuzenevu.pdfIn PDF document text
- http://mtegl.wsystem.sk/userfiles/files/pufemewepobiperametesumij.pdfIn PDF document text
- http://thongthien.vn/upload/files/webibelusozufeme.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/delanotekagopiziv.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/79663828231.pdfIn PDF document text
- http://zoo-foto.cz/userfiles/file/jizov.pdfIn PDF document text
- https://eijo.in/ckfinder/userfiles/files/fuduborajigisalaredaro.pdfIn PDF document text
- http://carraracucinecomponibilitrapani.it/userfiles/files/46587469570.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095919a4ef---gilusokarimuli.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614665e0e633d---fifit.pdfIn PDF document text
- http://theseadiaries.com/ckfinder/userfiles/files/bisikulazozotirimozebidal.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/warebekonorawozatupokol.pdfIn PDF document text
- http://www.perchegouet.com/ckfinder/userfiles/files/tukolesusutowimixotosow.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/nosixozejomuladusadel.pdfIn PDF document text
- http://kanizsakran.hu/userfiles/file/85494110085.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf8397444---sufede.pdfIn PDF document text
- https://uzunlarpeynir.com/dursun/upload/files/79844272864.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/zenofakekotexegokikope.pdfIn PDF document text
- http://aal.tw/uploads/htmlupload/files/61068470314.pdfIn PDF document text
- https://pepsima.biz/files/file/63171938398.pdfIn PDF document text
- http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/fisalanuluzakuzekig.pdfIn PDF document text
- https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/34796096556.pdfIn PDF document text
- https://ph2020.org/ckfinder/userfiles/files/55283163106.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/rekavirakerewuse.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0f73b7375ec826e0bd10a9c7d233fb1a/88606667669.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=caustic+3+full+version+keyPDF 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_off0000dbd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3EA	17400 bytes
SHA-256: `b654d7bfcacfd5bf3571e46fee6aa43b1451ba1da016532799a52e7531af4d28`
`font_02_sfnt_off00012113.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12113	10904 bytes
SHA-256: `27c948641a7c664beabd30c77662f849765014e791d5f082869601ae09c1c1d3`

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