Malicious PDF — malware analysis report

Static analysis result for SHA-256 887b156d6afe4376…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 22:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 279faba9743c69fa86524bdf07149434 SHA-1: 5ec487cbb7de593faf0121d5ccebee86d978e288 SHA-256: 887b156d6afe43765896c65ef6107aee6d5444fe75804649680c0475f0187d8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be compromised or disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://2sisaccount.com/userfiles/files/regujemorevito.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01c4c0ab77575435a62cbbe2f50e983d/bevotofosibilus.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3c3065fda5e61b2cdc21dac5479bf44/lukipibenafaxusa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/65193359104.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/7666869151.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800817839---39097166809.pdfIn PDF document text
    • http://biosite.ru/images/news/file/dupomo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/81ff3365e4bcf3c7fecd4991058e74cd/88983395717.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8g0ueriie17ad244kp2jqi2m7p/55091168069.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/36462660805.pdfIn PDF document text
    • http://stonebreaker.at/wukopugevifufitalebe.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/23953289278.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2645ead4---mogeroke.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/86402246310.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13b782912---76878193955.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132c7726fa---19691172875.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/malilov.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8093512e2---33061658956.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/semelemagatos.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/pesonofazatuzonewewotusif.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb8d2b49f---vewoxomofevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=x+ray+texture+pack+no+optifinePDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10672 bytes
SHA-256: e9df47076c3221b46240f6e0d2082c5d6d594d12f63da03b0cf1e0778a5c2124
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 18236 bytes
SHA-256: d189454215b3c93ea1fdcaeafcb8041b209cfeea77f7bdc9f5775366ef43931b
font_03_sfnt_off00013913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489

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