PDF malware analysis — malicious · aa7c6bbe895042c0

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 16:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: da21aaec808a627fa44541f8cd39bae3 SHA-1: f85cc0d9d80ab626f3d9e317815f3d94e314e0dd SHA-256: aa7c6bbe895042c075d10dcb344a1c6782433b2ddc455b89341089b482dc64f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm points towards an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/19dtu4s9m94b5bk3o2a89sltr7/nusatunopasefinudok.pdf In PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a5f29157c964360e35def70414c93239/14581215130.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1304ad20d0---53861221621.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6780db40af---votoxakawewulofurufununil.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5498c07d---letezuporoximalo.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/653060fa65a0ec4081705aba53aef273/xurolaseletabulejewad.pdfIn PDF document text
- https://ovistar-dz.com/ckfinder/userfiles/files/71602082912.pdfIn PDF document text
- http://federicozucchettiarchitetto.eu/userfiles/files/vafaxeguwemenunubupali.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a441731e0a557d8ef5c0e1e5b564472/43631090539.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862de7e02bd---17062952600.pdfIn PDF document text
- https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc44c27f7---potigimu.pdfIn PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/37625910488.pdfIn PDF document text
- https://topaldanang.com/uploads/image/files/bapedevegogegobisija.pdfIn PDF document text
- http://dunajecbiala.pl/upload/File/73059286870.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080efc330256---texubusiw.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/tudakeb.pdfIn PDF document text
- https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/21191696164.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b683f2f78---65723395751.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7eb4c34fe3---pixagiredusuwedetafo.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf625e81d2---zefatotamelebol.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/losirozoba.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6915ad38---pamexupoxepo.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d88c958e2---74384736767.pdfIn PDF document text
- https://a1-recruitment.fr/v2011/Files/fck_upload/file/50772329418.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/15030f05bce06ce85613f5de3d2db8fe/fogoza.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e61bc62e---tamiwumazozokapovama.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=call+of+the+dead+easter+eggPDF 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_off0000ebae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBAE	16472 bytes
SHA-256: `6a286110b7eeec08c9173be5c0638c2108d139349f7608f239011e60ed9056e5`
`font_01_sfnt_off0001167d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1167D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E94	10468 bytes
SHA-256: `a4eebd9bf57662d7c4a4ef45272988e6c1561c578a0892e7bcd20d4bd3a7b388`

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