PDF malware analysis — malicious · f42510f7b184a7e4

MALICIOUS

PDF

86.7 KB Created: 2021-07-24 01:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 502f54adc5c9d2eae19cc431b24065db SHA-1: 8afd5667aab0474c6502040e3910a933b1f43a8d SHA-256: f42510f7b184a7e4a33d98b8df6a910202168aeef86191702bb941ecaf0e9dc4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://3q1p.com/upload/file/2106241257518750013prbg4c05yla.pdf In PDF document text
- http://www.bsa.by/ckfinder/userfiles/files/dizew.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5aa53751d70bdb993dc30224ced7f6db/bigilugi.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tdctu0osf7mlq8cpj8f1pdme25/bufoga.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0a0b08963826c49d312c322932c874f8/39208198569.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0243592e3b---duvoxelamiz.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/8883696195.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u52i5h13bgfd7iknn1f8pqtei6/45838698902.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c67a6f5c4---nilewulekepe.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1200d215---15389703876.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210516120146_u3o8uu.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c255c6f1329---jimorom.pdfIn PDF document text
- http://ergo-logo-bamberg.de/userfiles/file/lovubotitegesop.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df47a1b78d---bexunow.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e0be1d5a9d21d1b3affa993ed094e0c/vovepubu.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079c35e23f6e---60392014205.pdfIn PDF document text
- https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fc30de44f3c1c166efcf835a0a7cef72/tunomobepazekanawatemi.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/5506542872.pdfIn PDF document text
- http://grandp.ru/userfiles/file/vidofoxulejufuvupivodo.pdfIn PDF document text
- https://soechi.id/userfiles/file/vukedulojifibaxekir.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf83d6b89---bozitiwutudusi.pdfIn PDF document text
- http://atomleasing.ru/media/File/8520425474.pdfIn PDF document text
- http://sumtinathholidays.com/admin/uploadfiles/file/64370927601.pdfIn PDF document text
- https://cakesandcupcakes.net/userfiles/files/vofunenagajil.pdfIn PDF document text
- http://josephlillianmorrisfamily.com/clients/59960/File/bovewowa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+kaiser+urgent+care+open+24+hoursPDF 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_off0000eecf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEECF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000106e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106E6	10948 bytes
SHA-256: `6a8c96c603e68c13c7329449cd22d139f19d210c0c4198231d3b04804dfc7d5f`
`font_02_sfnt_off00012053.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12053	17004 bytes
SHA-256: `fb6d9b0ff2720f476b070e5bd0063745d55e8c9fa5ade98d24411078bbdf6fdc`

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