Malicious PDF — malware analysis report

Static analysis result for SHA-256 04556a8638a10c8a…

MALICIOUS

PDF

98.7 KB Created: 2021-07-07 04:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 647b2f27a420b854d56f02b702f1a05e SHA-1: 386860ca12af1e745a8e733561696aa36744e574 SHA-256: 04556a8638a10c8a95579494834ab0679d3a5df15a0765607d87c61c5f3a2708
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the extensive use of external links strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://oniceh.ru/uplcv?utm_term=coincidence+marathi+meaning PDF link annotation
    • http://artecgroupservices.com/imagenes/file/wivozitaluvilizugewup.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3492ecea56---veliwugipepigoguxuzabu.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/tevugowilikir.pdfIn PDF document text
    • http://atya.eu/files/file/2556635268.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b5b92687---depenimiralifomodo.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32963957207.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/mugufiraniboriretemo.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/7904634981.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/votelovoxetejinuperilo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d0c48c85---29536212897.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ebd1906f6---54799951098.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0f34ff42b9df9855eb4da8a4ee673f7b/famajijafufovibosizik.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d291b6e77db---4218239476.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kovenuzapoxij.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/78271716558.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f236a0bddafdc77d1bf124139d0c08eb/kasizitedit.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7p3n2qsvv3shfd5rhc47g3e3q1/rekelizopogovozo.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/14548152172.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317bf2139.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/11014400321.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c7792fcc6ea9eb886a296ff1819a9f8/49039164438.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/37595224626.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbc04c0be---lijitasavoxek.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081655f702bb---mofuvabenezigome.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q79nakemk47ad0i1d6t3ue6us1/fojapezevasuwinuge.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 16572 bytes
SHA-256: fc27fe1a9b5770342b9cc31d21f2923dd5f62ecd84d7430295de8bab3bcfe248
font_01_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 21356 bytes
SHA-256: 77061bb042bf8489304c09a17d59b4a6d0820d1e9ed22c3ca92615a8857ae869
font_02_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 10632 bytes
SHA-256: 160803c249604eadb577e59dd22b569e29b839cfecfbdee9b84d5906e71c23a2
font_03_sfnt_off00015ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE0 2048 bytes
SHA-256: db74818a4bcfa3a767f1fc73af3be0bc5648ae1a03145d6d5aa7f499e8f572c9
font_04_sfnt_off0001644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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