PDF malware analysis — malicious · e332109388241af8

MALICIOUS

PDF

100.3 KB Created: 2021-09-03 02:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fcb690830c684190d8ef8a839a5a55a5 SHA-1: 4037c5733ba689422ecf1a5cf4a20f3b611fef17 SHA-256: e332109388241af89ca557757a2ca0cfab44bd8076d4a17798bbc1223091cf54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9928

Heuristics 6

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 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://oniceh.ru/uplcv?utm_term=conhecendo+o+hinduismo+pdf PDF link annotation
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1394c0ad26---40761261689.pdfIn PDF document text
- http://carsonpokebar.com/uploads/files/43989717745.pdfIn PDF document text
- https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdfIn PDF document text
- https://dienlanhhonganh.com/images/pic/file/wogefegadirarisosibijuxuz.pdfIn PDF document text
- http://brmc.jp/user_data/userfiles/files/dadavokulejogikugu.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d06f3892841---40189758112.pdfIn PDF document text
- https://cakenepal.com/userfiles/file/najusoguwa.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/defilexutalere.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fd95a7e1---82234681085.pdfIn PDF document text
- http://bhs1966maui.com/clients/64750/File/rasorixuxusoputero.pdfIn PDF document text
- http://mishor-uvk.com/uploads/files/26244711427.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/0c2208c911b6baaa8813b7ab3da29ab3/zidak.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/nuxolelodopatoxuva.pdfIn PDF document text
- https://speakingparrot.com/upload/ckfinder/files/73359640812.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71da9efed9---wejedazatasipevegofenane.pdfIn PDF document text
- https://pristineleather.com/userfiles/file/kobakabolosowuwiza.pdfIn PDF document text
- http://guidesdugrandlarge.fr/images/import/file/75645509863.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/95e1b5ba9fba3350d3a9b0b14e2e124e/kuzemodibezodogo.pdfIn PDF document text
- http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
- http://studioarchterreni.it/userfiles/files/sajis.pdfIn PDF document text
- http://hueide.com/upload/files/86327132602.pdfIn PDF document text
- https://webtechnocrats.com/upload/file/73428371943.pdfIn PDF document text
- https://horacebatten.com/ckfinder/userfiles/files/medofotekad.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/fikupisefibuzawizigijok.pdfIn PDF document text
- 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_off00011c19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C19	10608 bytes
SHA-256: `8c6eb650226286c7911d7d785d7837d2118dabb86d92d0a04b1200aa9982d535`
`font_01_sfnt_off00013417.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13417	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014c29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C29	21764 bytes
SHA-256: `c93b7b52af3cdd71adc07d76c8fbed95babf93225649898f08b59b708966b77c`

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