PDF malware analysis — malicious · 42cbd159d2bc1d2f

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 15:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: a89dff5d90290d94b7f27ab359e5fd73 SHA-1: de6b63cb20af1582c8ca54a62c147c091e2aa666 SHA-256: 42cbd159d2bc1d2f269f37c83ff7ac7dfab0f2486429a7f3ddf1ae966a8ffc0f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites utilizing form plugins for file uploads. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7f1c72e19f9146a49727d6f2b83cfb20/31735808656.pdf In PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd53bceb89e729e00f049e8c094344c3/duxamexelin.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mgmdsaq1ch8dk9lhek0hpdnqcc/wafunonebumegelifadibemex.pdfIn PDF document text
- http://beepost.vn/upload/userfiles/files/71630018000.pdfIn PDF document text
- https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e61b8fce6c81e5b63b12607031e1f77/zofivasojezizekarot.pdfIn PDF document text
- http://fecirturizm.com/resimler/files/28060706937.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cc822971---72902273054.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210623234800149.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609736e1d9c38---mibeg.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0564002ff6---55893585506.pdfIn PDF document text
- http://sb-78.ru/files/file/21175921622.pdfIn PDF document text
- https://an-professional.ru/img/files/file/5491532001.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d85b1fb5---91685719639.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082514eadacc---nagesosunukoderexur.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2faa95af---wuvixi.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cd65581d---79602353619.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e17b2c209---zogof.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6ab62414---73317467423.pdfIn PDF document text
- https://activepymes.com/pub/file/gajisokojadofiwigu.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a920e58e8f52125dc842434dff8241d8/paxalozitenudiguwafu.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0a3d9353---bobolimixazetebim.pdfIn PDF document text
- http://jcbcharpentebois.com/ressource/site-image/files/fotozigowano.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607318f7584c0---31227903455.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7b0e649f30f6a9c1909c0ffde334f3c0/16466778942.pdfIn PDF document text
- http://speckrepeg.by/UserFiles/files/banunukojumop.pdfIn PDF document text
- https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e7ef3df06---95545483048.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+asteroid+coming+to+earthPDF 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_off0000f26e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF26E	17072 bytes
SHA-256: `4d7d22dcc8efeabce83fc2377d9eb368827f9c5fe56ba2125c2425513de9aed0`
`font_01_sfnt_off00011ee8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EE8	10832 bytes
SHA-256: `8d7f60e403da08b7f1c14f206311512c451870d717ccaa754707668b33df8b94`
`font_02_sfnt_off00013795.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13795	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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