PDF malware analysis — malicious · d5847a661e290106

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: b3728bc070d2cd76289cb11225454672 SHA-1: c20f139f7b397aea4803c06ef4b1d9aae0ee25f2 SHA-256: d5847a661e290106c0f4ca2df54b90fb4d83c134a192f064bc4f1db0887d968a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=mobil+dte+named+series+pdf PDF link annotation
- http://yuhenganquan.com/userfiles/file/20210828151029_555817185.pdfIn PDF document text
- http://sva-jeanroze.com/xmedia/file/xusirovu.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/sufiduluxomizajagev.pdfIn PDF document text
- https://escaletravel.com/userfiles/files/pediweza.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c156bc3---kemodebemarukonawaja.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ngoro4sa10674uqsjk2polv24k/kerapigotomewof.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070017c70915---vamurawofoloxalur.pdfIn PDF document text
- https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h0r7lkktq4g3sbsp689vd4f45g/85214910322.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e20104fada99705b866a19f57b6de724/59773277087.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/311kv333lju619arjvb3v12ouh/bitojexovinebibozedi.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bac709b5f---89992914250.pdfIn PDF document text
- http://cleanyachts.it/writable/public/userfiles/file/pipigavexukuruvotur.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/23b18f985549e191c25150d8b3fbb6c8/5666655022.pdfIn PDF document text
- https://datajournonepal.org/files/82458864174.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975e6194d0b---42070447236.pdfIn PDF document text
- http://jncs.kr/page_data/file/20210531034232.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/89499397134.pdfIn PDF document text
- https://kermanrooz.com/img/files/45091658826.pdfIn PDF document text
- https://hideab.se/tc/Mediagalleri/file/45292044454.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160718fad48297---43994663445.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mv6bm58g41rcbho14dpvnqd2ad/14116183544.pdfIn PDF document text
- http://yoshitomo-kokubunji.com/jcfiles/file/lelisuxawamobuvagabe.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a2290925526f828ae7ceb3d6947c30e1/venawusutunivi.pdfIn PDF document text
- http://kaies.cn/upfiles/2105251610204231428fz8j7.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5793228569---86583922658.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0756dd3e---wumakesidovodivo.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_off0000ec59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001046b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1046B	18500 bytes
SHA-256: `20ba73009ad5f226ed71e5b46dce47b7fbaf9a526ca8cab798296f8f31c08790`
`font_02_sfnt_off0001341d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1341D	10792 bytes
SHA-256: `2c024b47f4efed09da93650b11c55cff8725aad680311c508166b9fc08779c3b`

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