PDF malware analysis — malicious · b7f40f482495b103

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 19:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 5ef135f5ab80fb6687578c4c954a48f4 SHA-1: b093f7b9106409f7288d0a385f3a6f3bf95a0ca0 SHA-256: b7f40f482495b1036a2cd2f4b4ac7b8a73cd7cf8ee5103442953e7411e6740f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=most+common+cause+of+diarrhea+in+infants PDF link annotation
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/en03u0uu2vgkfic3s3tc7kpgp8/99361917701.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62899adc---89319863599.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ba2dhcucg5on08a0o9s4baqugh/46770573802.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/uiarbv4nqkvao0n6l7m91k5897/74830255912.pdfIn PDF document text
- http://modamoda.nl/uploads/pic_lib/file/baboro.pdfIn PDF document text
- https://3drm.bg/uploads/pictures/files/tobugapunik.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5895d395---xodowukiput.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd57a95916---fideku.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/vedibabegefofuwumanazileg.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4d509a21---nezizunofimo.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa54f8921a---32866037643.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1hhnd8ibkqpkuifr9juh4eanfo/tekudisoxifabesutav.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61b9aca67---55580509534.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/103sojkq0pr96dlk1o3ij71vmg/risigegetirerukop.pdfIn PDF document text
- http://e-district.org/userfiles/file/33580071832.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94e281f60---28182558842.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ab740d90---xomasiladutig.pdfIn PDF document text
- https://csodamalom.hu/files/files/70950065993.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/19b71b032b0b78561382145bdcda44cb/96279668147.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/tidisawomipomajurebuta.pdfIn PDF document text
- http://xiaohecollege.com/d/files/mulufuwaxakoxaxadup.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160786a0639b98---73088931433.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077068160dcb---fiwuwugubedelapezikiz.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/42479936088.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_off0000f5ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5EE	16680 bytes
SHA-256: `ac9f6ffe62926b04c99e377ed4f3b1c4f42b84608335ce50979d65b8ca0dccff`
`font_01_sfnt_off00012150.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12150	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13967	10788 bytes
SHA-256: `4cd443a8007b0b4fe55403f632d3a1c4d5842408d5af735105547046f0ac7c97`

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