PDF malware analysis — malicious · d56305b168af1762

MALICIOUS

PDF

74.5 KB Created: 2021-07-02 02:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 5f093a9fe174b9bfda25d4661673dc03 SHA-1: 8a0463b175eef320c3889a1d2680fbfbfd6137d1 SHA-256: d56305b168af17620f8f6b2b0dd5f844cb6f3e2408373c06caa87d9786d337b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to domains that appear to be compromised or disposable, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://hurtowniaroza.pl/upload/files/fekaxumuwir.pdf In PDF document text
- http://studiophotosfashion.it/userfiles/files/vanovowuz.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/60364255802.pdfIn PDF document text
- https://ivanamihic.com//files/34267936189.pdfIn PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd574be72---54255542543.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/90h1vvomc7p6bkr81l4rq951km/39900301759.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e55391c43---75594116054.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16080812718baa---wunasawikabobib.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd38968067---59952616159.pdfIn PDF document text
- http://goref.ru/files/file/62940340641.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a089fea6775---84307978668.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160943ab2c0c6c---96956069199.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/8546009918.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c76e71f80c0ef1440827a1715b363f49/fufurimenakiwa.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fa867109b222c932a59d309c6139a1ac/8153022536.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5ece4d7f---vuguzixilurepotaduraj.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/6mu2vum7o2f9p3fg3hr9e41j92/vorosazunajebosomuxiwo.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3fbcf516685490b501530d213175b7e/melipikivebewexazesarut.pdfIn PDF document text
- http://shinex-auto.com/userfiles/file/kejifodejapigujepakasefa.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de4e5f41e46---64397742622.pdfIn PDF document text
- http://www.ecvbrass.ch/user/web/file/wetowilunuz.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdfb40d6e---81581331336.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15584134a3---70558541770.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1c40f0bedb0526b75788e446ec5b0d73/40925503567.pdfIn PDF document text
- http://vita24h.com/uploads/userfiles/file/nimujodedomukowabaxugi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+analysis+and+design+of+linear+circuitsPDF 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_off0000c088.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC088	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d89f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD89F	10932 bytes
SHA-256: `b667790e7499887d4c37e41cfa71e014857a9d1ed2bc2033a9a502f9146a9b4b`
`font_02_sfnt_off0000f1b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B9	16800 bytes
SHA-256: `77b0255eeda7f1e91b48c034e0c785a5bf33cfd763e1b9e660a4fa50e790d6f7`

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