Malicious PDF — malware analysis report

Static analysis result for SHA-256 57543c3135af0c11…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 17:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d703f7e4b657d617a844be04fc66e0d SHA-1: 72d55b7ce7c5b177cb6656b60df5c7f7b9bdd67a SHA-256: 57543c3135af0c113e1fcccf1a964202ff7f691e0d4282d134323c9d2053c9e8
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS upload directories. This suggests an attempt to distribute malware or phish for credentials through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://termofriz.rs//files/13432415751.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/gppq1geop8j4l863srmi2kmm24/mulutep.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6cf8d2df63dd6b3929c701035efb5e59/86080321185.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52ded3317---88296790593.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/61109023831.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7cfa42091406358991e5381517b7c2d0/sokaxujajesunekobagogeba.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c69a8f14d---29321491327.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/84584737853.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c6d0b26b228a64a391247463afc9a230/zoneremefabavufuzepunofu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac5b853a2ac---welobapel.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bce1f098d---godimixofaduronerug.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/66742786624.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/53963977114.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609e604a29230---92835673669.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91a1c4fcf---36130706833.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wafavupemifefelajilitig.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/338227e8332109223895746e92bccc60/rosikulujagiwaku.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/giruwumivonesewiwe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160903065aa0cd---gubimadexijevufudoga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83984af7b---3935589334.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/dalidofufabevipofiwo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/63635885276.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lesumaputonojotewaluvuj.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210809_19_41_56.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/89670929077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=non+aqueous+electrochemistry+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 11220 bytes
SHA-256: d33fdbbb18e25063a8a022488746e148d6760d8d6a1895f6a55ae3891f621f57
font_01_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 18824 bytes
SHA-256: 4ee6605d8aeacf852391471b35b6e74d17029a7baa972d256990d44ca71d8ff6
font_03_sfnt_off000158d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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