Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf42df2750dbf0a…

MALICIOUS

PDF

103.4 KB Created: 2021-06-29 00:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a545d3dbbdac9e00348903de825d8a6b SHA-1: caea201a7924fda475e1283d991d567fc88610d0 SHA-256: 0bf42df2750dbf0afce6f7c35a9daa897d079288ed5f784893668c874aa91f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://dcoderesearch.com/uploads/tujidatozuvujuzume.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/18829325042.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d922e88ea9---39765913701.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/36826d468eda4cccc0f7f34f064e876b/nenabu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e514bd33f1accd54c37f019526883dcc/vosidaxewijakele.pdfIn PDF document text
    • http://biosite.ru/images/news/file/89865756870.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/gajupoxilurolave.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4444a01cd---88021117661.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/weletikuliletigepozifefe.pdfIn PDF document text
    • https://lecachet.fr/docs/files/62558730501.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/68201577918.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/jujamupetefudebomen.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/begoziwukefaxemow.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/83108320092.pdfIn PDF document text
    • http://liyangah.com/Upload/file/rotuzibiseweturosaro.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258c347ea1---gotavamire.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3f5363f19---15855422552.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/63c7e75f173533f4be314de520fd35da/wilaw.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/godozererunilomalufinarur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/deviwasuperuwox.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ra9bpfvh6lfen39s5i6akcu5dj/sumapazalivefo.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fajowebezorebi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/66312287648.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/891d86f2defba19680c6089dba1efe65/fopujesunilibotugob.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/41360a83344bb569e17f26761baa4fdb/babasofuwufoja.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfaed74f3d---vazabevekoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=small+pile+of+rocksPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 19196 bytes
SHA-256: 6e9beead0fe3feebcf2f2854ebad507a841925149b5875e046594f77c6f81f4b
font_01_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 10604 bytes
SHA-256: 672989f9f24fac3e6e314527ec8b0c4eb24398ddee63d002de85b1c88f7d645b
font_02_sfnt_off000146e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E7 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17439 7788 bytes
SHA-256: 75e749de71c1a7aa69ab4fe902ca581adbf9a65e75e4e1eaa5a11e2991d1eeab

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