PDF malware analysis — malicious · e72752de4ba96e2f

MALICIOUS

PDF

89.6 KB Created: 2021-07-29 22:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: acf52b8fa24d111b76f1fe1af55b382f SHA-1: 09eb8efadb23ad4dfd2d1774bc398f691cf9b0f1 SHA-256: e72752de4ba96e2f0ce3e114f112771f7dc96935102d34418d8ccaba2c2aabb1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 websites and disposable hosting, likely serving as a lure for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ejercicios+de+leyes+de+signos+resueltos PDF link annotation
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e36457247---88201430486.pdfIn PDF document text
- https://wecareu.net/ckfinder/userfiles/files/85265978222.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f2e4070f1---24909588602.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/22h9g7bjvruntlq7v556fr7pq4/pasababirilusuvumifodoko.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac81d6c269---34502000054.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083250109eb5---vedotazarafizibakegasax.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9f61af75---denew.pdfIn PDF document text
- http://nfrostov.ru/upload/files/nivumixagarafuzu.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee38bcbd8d---76122168727.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/lofegalovomuvafesidox.pdfIn PDF document text
- http://coaching-scolaire.net/userfiles/file/29933175054.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/wenojotidejiro.pdfIn PDF document text
- http://easyliveconstruction.com/ci/userfiles/files/53580638109.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/de87b4954300972ef82565a405832254/vodezotodiboritirunijofe.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2a4abad1f2d7fb4885d797c69c5f00e/fudukanijew.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094a21c85e13---nilegumijixeje.pdfIn PDF document text
- https://burstallconrad.com/editor_files/file/99660327798.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/65132511dd76031478180f6d9dd8734c/27409518245.pdfIn PDF document text
- http://huile-de-nigelle.info/userfiles/file/wewidisezorinufegema.pdfIn PDF document text
- https://weeb.nu/userfiles/file/rulozaluvunagixeka.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/afd51e581612676e018ec9db98a5e418/29157567449.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418fd204c0---80063633825.pdfIn PDF document text
- http://saovietgroup.com/upload/FCK/file/28550403914.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ep2as3ig6he9dok80ppb960ke9/19610626360.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_off0000f561.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF561	10708 bytes
SHA-256: `c1f06a568d89eba0aadf8c905e92845c9c3301acdbe96587042eef7c8b420320`
`font_01_sfnt_off00010dd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DD4	19000 bytes
SHA-256: `c987e94c8d93d2f259de6eefb2afcd717f47cc7b39847c9e124d91ae454898bf`
`font_02_sfnt_off00013f00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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