PDF malware analysis — malicious · db35bbe2f0a94d80

MALICIOUS

PDF

76.8 KB Created: 2021-07-26 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8611cd245405f65e02edc74e96367fd7 SHA-1: 7cc6d12e5ab54e243c91036ab84e0ab24ed38d64 SHA-256: db35bbe2f0a94d8044bf545a73cca6c07fa4a14ecb7e194a86c0c7d3256c98dd

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 or phishing lure. The PDF structure itself is also noted as a link farm, further supporting this attack pattern.

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://kondicionery-fryazino.ru/upload_picture/file/fewonadujop.pdf In PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7vi63o23o2767cn8rfs13n6a7u/sevatagofobulemadedu.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/kezavejumeroxixusogizo.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/48fea1a44282caca0e9b375f59d29ebf/waxupit.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b5863f64a5d1049d726f6ca8c0a8848c/10865939728.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a855ec1bb690f05dd7961c20dee208d3/nulirudel.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16097b326a21d9---16547039562.pdfIn PDF document text
- https://dm288.rs/slicice/file/38587351823.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7d1b7f92bd71a9975d8ec19e6f3ee1fb/malojinulazifutedepig.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f23b02bf124---neditoju.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098284081ccc---54365276677.pdfIn PDF document text
- http://optimaglobal.net/ckupload/files/vazunajajitemakeguvev.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13ea074e9---30266919935.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2591c81f3e6c6b704b8325bcdb170494/20298669955.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdcad0fc1c---sukiguxudimaxabes.pdfIn PDF document text
- http://dobrasekacka.cz/userfiles/file/sadarumijabi.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6353767b---78497779454.pdfIn PDF document text
- http://jpmoto.biz/upload_picture/javofaju.pdfIn PDF document text
- https://prestinieurope.ch/userfiles/files/zilepi.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1luvks3v44148b0n5q0341u4f4/7394215063.pdfIn PDF document text
- http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/1458864558.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/096bb959733b232591c27087eae1e982/75202775562.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5ung9p58emkoqgoi0tj8igusv4/47175368003.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/rosebafuwubav.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=beethoven+-+f%C3%BCr+elise+%28klutch+dubstep+trap+remix%29+mp3+downloadPDF 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_off0000c15f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC15F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d976.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD976	12076 bytes
SHA-256: `7d0c268c1662357463fde3e3b87d30bfe763ae7c93f06739904ea04116122434`
`font_02_sfnt_off0000f628.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF628	16928 bytes
SHA-256: `e6b2f31bc8d5a56d707c6cb9510e2d1b765f415fdd52c93d0df9bc03e7444d35`

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