Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7fd65e8368e7f7…

MALICIOUS

PDF

74.1 KB Created: 2021-06-27 06:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 781bde7ac95440c8e9ca2f3c971ea5ab SHA-1: 57848d421d89eca38fc538009217f75c7aceab45 SHA-256: 4a7fd65e8368e7f7eeb177595d25eaa4d18130f33922b8167a0d155bbe1a5083
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ce6uotp14bkrsbghoa6fhh6j6s/dedixebaxadosiza.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec14d800c6---fuzikepozuludurafoxa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/55099099394.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083350fe2f50---tafajog.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5329f943---sunigazinorepunedobikov.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4ef7e73e3cc798f617d3e7edb8e4dd20/lizasugaforajekuxorikilu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16071a705cbf1a---muwimukivebemifopo.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/dabeniguboweposelotezu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/afec69190fad446d8c76355024fd5eec/zupamixirufadetowevux.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/vizuj.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ujk3pbhbn2ir49hi4o6jvcqh95/wiseforumutudodiwawapuj.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb96aee85f---pafekagabuz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54bd4bba0---65867267951.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2d73f980eae813b9067dac047805edde/21281494304.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171830321568.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uk6e0fgta1m8s3r73c3rddr40g/24534659114.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/xikema.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/76372581084.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/xijulizamopipelim.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/anpuvl15rj0gp8s1fbn9nklhk8/23647317032.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f0e912f8---98974259637.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ginamaxoz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aed7gt7h0k03ncjn4qp8v15v13/43027701606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sometimes+u+need+to+be+alone+quotesPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 10772 bytes
SHA-256: 6a600ca72a2fbcff95e01d4a6b3ea15070024277b1feb8416dd462720d60b2d0
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16892 bytes
SHA-256: 807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
font_02_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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