PDF malware analysis — malicious · d491b2560544018a

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 16:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2fbb0c3d561f78bc147402c9f2e38828 SHA-1: 54db2350349324dba66b44e0a52d1b8007226ec3 SHA-256: d491b2560544018ac9c2146e9b2d09f6a4fef2e4351880ab29c6b8ab52c2b12d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile strongly suggest a malicious intent to exploit users via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://congtrinhnhaviet.vn/upload/files/zulosizal.pdf In PDF document text
- http://trungtinjsc.vn/upload/FCK/file/belozuwagisoti.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a929aa19400---rodajezebimavelatawo.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5106aec0289befa667de4da8a605d37c/4317828322.pdfIn PDF document text
- https://brigitte-farner.ch/userfiles/files/19759291731.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7a0020dd0de6c086b74096cba762e5a2/11330815797.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fab5c522a85110ffc4758b8fb62cac13/82247317838.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec2c353e7---vopuwitoboluxev.pdfIn PDF document text
- http://aptwash.com/userData/ebizro_board/file/2366363778.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/jerekukiwuvupukawi.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d861c2afb---vajofofojofup.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jcfm97jbb3gc539sacjqp45ivv/navuwomofaradejudu.pdfIn PDF document text
- http://harasim.cz/uploaded/files/12674656097.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084bc152b8---6897544452.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/kukevesu.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/xunetonedevizaravavalaj.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6ba6ee6b---89901857200.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077663568123---47378072572.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e70965001---32986118909.pdfIn PDF document text
- https://baatco.com/ckfinder/userfiles/files/33886011140.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6651528fd---61952161264.pdfIn PDF document text
- http://lookkorea.net/userfiles/file/wobimedezawum.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/63147120708.pdfIn PDF document text
- http://headrepublic.pl/images/files/12574020099.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rme+fireface+800+user+manualPDF 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_off0000ba2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA2E	15744 bytes
SHA-256: `163ec18140011501fe1795a14532c94cb39a112c863b9568f236402d591d222e`
`font_01_sfnt_off0000e28b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE28B	10756 bytes
SHA-256: `0e88028af15b62c7a13e59bf9f9a42401dd6876f5828f09097374fb397f2faa7`
`font_02_sfnt_off0000fb40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB40	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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