PDF malware analysis — malicious · 4456d8366f8a793b

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 21:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 1c6ba476e88339dc30ab7666ba50a947 SHA-1: f8b84b8229faed099e89d8a112d3765170eabb14 SHA-256: 4456d8366f8a793b9a57e227b386ea2337204d38741ab7013540ecc7d02e5765

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple PDF link farm indicators further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c0b847851c407cb4c836827efe1c96b1/88423335450.pdf In PDF document text
- http://clinicaveterinariacene.com/userfiles/files/42576393675.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc91bc793b---jiduxegunipujonu.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/iubha2a6s9b3gf9e91s1398kvk/4097977637.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/turodawotebivuxumoz.pdfIn PDF document text
- https://hoalavender.net/upload/files/sukotudazujepabobakomoke.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/984928326eb1b97be0b0ef8849c79aa7/dafifovewalezinarezux.pdfIn PDF document text
- http://vmkmsz.hu/userfiles/file/64631794830.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb49bedd45---motudizepofab.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160790ae00e663---9496062558.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdnubu3cqm6nb8dfdq5h07qvma/nafabekozinuwuzelukiliji.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841d87b0e44---86696110364.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/525571614e800ebbc81776d3f11c0d7c/nogomifamomoveje.pdfIn PDF document text
- https://calmoinc.com/upload/editor/file/pusolegezotuxugakusej.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/37485319479.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/42a6ee961bc2ddd958f23c0395260bd0/rosidelel.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cd198419639f3ad287360077137e4572/43148840349.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1d1d966d76212680adecc29a78bf1acb/16825123344.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3ab9e218---wabimawipoju.pdfIn PDF document text
- http://dragonera.cn/admin/userfiles/file/dogitiferenagog.pdfIn PDF document text
- https://learningsolution.ca/userfiles/files/37092947247.pdfIn PDF document text
- https://fablab808.com/nbloom/fckuploads/file/befup.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/87e327d5a14414b6c0ad0699e655d739/11009618263.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/dibupeji.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/84d7880c292d28bc1e8cfb4ee042c8c9/sefigubesufajomumub.pdfIn PDF document text
- https://aldapa.eus/files/galeria/files/44534733861.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2153863037---9596369858.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=good+morning+nature+picPDF 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_off0000eab9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAB9	16780 bytes
SHA-256: `486df00ef53d2a8fdaa2233f4d599fe5d03ecb638986971a3cca2faa66dd44d1`
`font_01_sfnt_off00011628.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11628	10784 bytes
SHA-256: `5f4b319acaa63c12af187021ec0438e36416103790f8042b4827a226e64e13e5`
`font_02_sfnt_off00012ec0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EC0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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