Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d541ab53eb3a4b…

MALICIOUS

PDF

97.8 KB Created: 2021-09-16 07:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c711ddb593b654a2648c922328ca2f52 SHA-1: 1e1abeb8122730426925134fb60832638684e879 SHA-256: 53d541ab53eb3a4b38c37699f5c91e333ca96324cb55fa86fe67abb9f1f90178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/337bc93924116390f95c4feda26eb3bb/fomirewaliviwuf.pdf In PDF document text
    • http://queensparkview.com/image/upload/File/53598592242.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/95004715947.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/rarixifidotivinumezofebi.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedonutarere.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/60475599430.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/11190781200.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/ponawin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ac1802e31c84309b885f7c46be0fdcb7/tosexiritejopenemovifegi.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/31648084343.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379551e0365---99917539105.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904091256581642.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/kenobabokupapumewi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/xebolefujojewafojor.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/resofajoviparaf.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/vagakoterosozes.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210907040642618877lx2vibt2vtrv.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/dixobezezewadusigi.pdfIn PDF document text
    • http://weldingplaza.com/files/file/lonedezemaju.pdfIn PDF document text
    • https://akemi.ro/hirek/file/8987598099.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/14973653523.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614291b28ab1a---wamewufafowulumila.pdfIn PDF document text
    • http://willbramephotography.com/rodusexaxajagagikipurune.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090615520073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=emulatore+android+per+ubuntuPDF 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_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 18480 bytes
SHA-256: c35195369bb876a2203de80986935bef0865216bd972aa11dcda0dac025fde6a
font_02_sfnt_off000161fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FD 10608 bytes
SHA-256: e7a30913893303bf394279e003d539eb946d6dba7179e7abab4a963f9a78ba41

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