Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c9488a2e1a0057…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 974360ecfdd17866013618561c96623f SHA-1: 8d44b2a6a6c7b1c442bc106fc8e1139a94ac4c10 SHA-256: 44c9488a2e1a00575716c4a5702701cf1f0a1483771a1f35c9b4781e7e91aa2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, common in phishing or spam campaigns. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=motorola+walkie+talkie+t60+manual PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5b78d79b---jisituvadugejolegujul.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8f205629658f2ce906bc97cabe405f97/bamitojuluja.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/tafudefazoradigadalibov.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/xamuravuforabifoxukat.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd0e07d91---fivude.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/sibuwemusofuxodufuvuxawo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dubuvosaluxovuvazud.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/guxojiburodidema.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b3bf56faa9542e279adbcc2b4b632498/75654804517.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zokuxufakolexa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9219599ab5c4a39ff0e7a8fc2dbd338e/xufuvuwogap.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/6sh1vg3tk2apfsgneut3huc8i2/53154536721.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8jq3k43qco5hptns9eprfs64t7/sidiridabiziku.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/rumoxukunosazarexugel.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4599e5c423---dagukakufexilete.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161116ba0f0a51---zixitubazejobikefazi.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/83868707192.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ade18dda6---17707513140.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16129854a7b8e1---torapid.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608781f5b1941---89026761215.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae701258753---67204967197.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/raxafuvafe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10660 bytes
SHA-256: 5ba0cbd91ad695593ba9f852080cd2d50d8eff57a7031b969ecda51af81f34dc
font_02_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 21048 bytes
SHA-256: e7996e541acdd5155bb9d1c50590fd5d85ff5f95fbd49a5e90333d91141cd5f0

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