Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5142eaf1534f0b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 04:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 914a25c48ff1df777a8e2275755412ba SHA-1: 1dee54c572fda1ebe3434d1db77bdd83c109f045 SHA-256: 6c5142eaf1534f0b07566475911a9de9d2c0f29b9200de7259884a6b3ab4d47a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. This pattern suggests an attempt to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2cf96fcf4---fujimapuleditile.pdf
    • http://honda-vo.com/upload/file/xoxudewilajil.pdf
    • http://acpiindia.com/userfiles/file/14418329250.pdf
    • http://oodow.cn/upload/file/210617011238885493o1gfp5mb6n4d.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e826c03051---famovuremarubukoru.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bb0d896---jajefivesofapapuwu.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160713cbe38ea8---95439957454.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2fbd1a193.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ecaobksikvk05f06lrrt2uo4mq/towixukesujug.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2146aa02d3e91fd059e5e5df1e6dd56f/kurosexomi.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8710f463d1---16426745699.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd435b5a5---zuxafepadoxe.pdf
    • http://pamat.ro/UserFiles/file/43784208130.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d126ad975d---88815417141.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4baee81ee945db5d3c7c418cf07e5b23/xunajibomesizozarove.pdf
    • http://sakuragiramenandsushi.com/uploads/files/gogupemujenizox.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef5b6a4e2---mixokasozerilofebabedaza.pdf
    • http://kfnmdg.com/upfolder/e/files/20210621215016.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88da3b630---xazojeviku.pdf
    • http://md-servicios.com/userfiles/file/62702279343.pdf
    • https://gea99.com/ckfinder/userfiles/files/95239693148.pdf
    • http://dreiseengrundschule.de/files/8359494552.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepawapi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944939a9671---79789598618.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829831a086a---kemupozowokinovezirox.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da607b9735---1462098395.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=poulan+pro+snowblower+owners+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f624.bin
ba852475e3774e89e4510fdb370d9ab100b5c953a216ca88105ca8a74a3351ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10548 bytes
font_01_sfnt_off00010e01.bin
ce9510e8406e7eafe4773670e41423385863703ee53c968f82149cb07f3046c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16600 bytes
font_02_sfnt_off0001392c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes