PDF malware analysis — malicious · da37f0135abb3b08

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 00:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9ae1bd7c675a9bd6bb18e9e6cb6cf825 SHA-1: 7ec54e7a0a563344091aaf6cb0ddd527bb11e207 SHA-256: da37f0135abb3b08ed18b79bb4edfc75fe9f2ac8f86691018525a72d5c2908fe

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, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing or distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=nutrition+articles+2018+pdf PDF link annotation
- http://nhuaduongnhapkhauaz.info/upload/files/98275909318.pdfIn PDF document text
- https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/sivewunujepitijaga.pdfIn PDF document text
- https://aronabritcan.com/userfiles/file/nesoxizimirirafenejifuva.pdfIn PDF document text
- http://china-miyaco.com/img/file/202182641751.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc696493e98---14193655518.pdfIn PDF document text
- https://marigabung.com/contents//files/nedisapujarujoturujaj.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c0i4sqfumh834234c5mqr6iiba/tolinep.pdfIn PDF document text
- https://www.tamilsaga.com/ckfinder/userfiles/files/veposumobogewazozi.pdfIn PDF document text
- http://phuongninhphat.com/uploads/userfiles/file/kidudowid.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf3be03e75---16288176799.pdfIn PDF document text
- http://baovethanglongmb.com/upload/files/sogem.pdfIn PDF document text
- http://kk-gorenjska.si/uporabnik/file/rugawewiluv.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/psrto2segpthdu31edhmrfl4a4/kolevapolaboxap.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/banikawigalorekanik.pdfIn PDF document text
- http://linhkienhunganh.vn/luutru/files/libilora.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/79431850737.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/aj1mcnftg2ko9subbbs2ctd5lm/4942066254.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115bba4cb72a---nejupasusevoporedewoko.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bcac1d4f2---pokogi.pdfIn PDF document text
- https://echipamente-scule.ro/userfiles/file/famodelepinarafaniririp.pdfIn PDF document text
- https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/butikuzazavexebarilil.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e307cd806f177299e964b9e16d3b8045/44136415760.pdfIn PDF document text
- http://www.dkmodels.net/ckfinder/userfiles/files/57557202876.pdfIn PDF document text
- http://ttlh.vn/storage/ckfinder/files/jirazakuti.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_off0000be76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE76	18332 bytes
SHA-256: `0bcabc93798d45e01c478fced8a3989d1829f70337c93e978c128df60679cc0c`
`font_01_sfnt_off0000edb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000105ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105CE	11192 bytes
SHA-256: `6f3efe947798bdebd0ebf7bd733d110d19994c4f1bab15d0a35fb3844ec17ef5`

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