PDF malware analysis — malicious · a0152102f5d67d2f

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 05:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 1dfdd2461f0b546a1b8f58076574fd41 SHA-1: 3cf48eec8284ea3f32d83c88131da4c69e9cd1e8 SHA-256: a0152102f5d67d2fcb97a3807ab31237666a73ba7e90fea1a3c9e9a2d3653a11

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded PDF URIs and the general structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://crysiq.ru/uplcv?utm_term=laboratory+management+denise+harmening+pdf PDF link annotation
- http://divorce-difficile.fr/userfiles/file/fogodikeredisodomeri.pdfIn PDF document text
- http://sisparts.pl/zdjecia/fck/file/safilosegokikalogobi.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/40806384533.pdfIn PDF document text
- http://robalton.es/Albums/images/file///51961377604.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a8d9959d067e8e0a5891245ae9785259/papuredotelitujofadapid.pdfIn PDF document text
- http://degeninhotel.ru/admin/ckfinder/userfiles/files/2644002465.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874784d84d2---42527568750.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0904l5ra6o8f0f0pd981oecjt2/lanubemazuvivorabamixonit.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g849mm0l5o3gop0g23pdjm2rns/sekokafimaji.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/38315479836.pdfIn PDF document text
- https://hansenlight.com/UploadFile/files/wiras.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33b3081c8d4a063db11b9463a882b89d/55690966597.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf7e4d4d66---6841861253.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217ec3b65b---somik.pdfIn PDF document text
- https://angelsstaff.com/uploads/file/7987496247.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/12453246498.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a5ek6af82hbknm88d1nknqqel2/7347549313.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15560e19000f7631f7502e930f152837/webetojozapilozonora.pdfIn PDF document text
- http://aqcons.vn/upload/files/95851991673.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/97183263835.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db0a4b6b7---3544167968.pdfIn PDF document text
- https://777mto.org/contents//files/puwefegixedunuzunasome.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21bca393a6---xosipogusuwikibov.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2f178acb---19118682012.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608370cc9e076---49152087193.pdfIn PDF document text
- http://goraku-sangyo.com/userfiles/file/2719193686.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///wifofixedusekadugoto.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hu48evr389rkobvhfkv1pvavcg/gasonakep.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_off0000df91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f7a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7A8	11108 bytes
SHA-256: `085496792dd33028d745d0715519278fb0178236568f9c0a41c9285a451c368e`
`font_02_sfnt_off00011104.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11104	19132 bytes
SHA-256: `b016d6ec8c3455cb3c860ac6de4b77ee4e7ba6685a04fb3878ea27c24cd11eaa`

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