PDF malware analysis — malicious · 3657c9d90a8431cb

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 16:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: e58fd0b59bb4dcb8b9379dc51a09689c SHA-1: 244b9ef5dbc0bdf395e0b28a2b0896e19544ff7f SHA-256: 3657c9d90a8431cb89f658d0186b5e8480268bc9ee174b64f201a0523d0bf1eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs further supports the idea of a campaign designed to lure users.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://guruamardaspublicschool.com/userfiles/files/74195560949.pdf In PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092f96f3d32c---84728145006.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/83f750380d298bd208e01e0af1172627/pixexosokadewuro.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3ab0b1e---14044826092.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/df938f4c1c15967dfe6a2387c18276ab/vipoketepa.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9e31103d---19145497400.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092446a93830---xajopanelutepobodim.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de570f29ce---livaxegewerokejonorij.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/xosexidigemopigoje.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5e40b0e5---50925041414.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847e704e676---vogitimasimoxotibebixene.pdfIn PDF document text
- https://watfordfairtrade.org/app/webroot/img/files/43991534219.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f9b70eaa4e88b03ad9174b153e029403/xofonapawezame.pdfIn PDF document text
- http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/69927300107.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0deb1aa524---7671198979.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3rlnpem3nrfr08qkh9c1jlec06/kudurekoso.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/34105812496.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1b42634f2b801a9a9fe9a2163c68be8d/1412689898.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/th3fm4e045jiaofj2esd8asi17/pebilumofovukowolizi.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ca4e30508c34e65d5753415ad3960cb3/tijuv.pdfIn PDF document text
- https://miguktour.com/FileData/ckfinder/files/20210610_BB7BF58F6606ADF9.pdfIn PDF document text
- https://rajakeempat.com/contents//files/41813048833.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=disable+your+phone+companion+androidPDF 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_off0000ff07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF07	11036 bytes
SHA-256: `20150ac249d01be4ed5b548425cdb4522c2ead6573c664298e75f14743532013`
`font_01_sfnt_off00011842.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11842	17616 bytes
SHA-256: `24aa98705c90f8ef66f9cbd20b739d638190e4dc7a0eefbe73514059aa183eeb`
`font_02_sfnt_off0001466f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1466F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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