Malicious PDF — malware analysis report

Static analysis result for SHA-256 22370db0d6c34651…

MALICIOUS

PDF

81.6 KB Created: 2021-10-06 12:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5de60688a33bcc345c6654446f706cb SHA-1: 116d6063808722ceea2a861c9c906c42a6b90484 SHA-256: 22370db0d6c346515920672ce5a99be57cc4d4ce6e522b66161012e81bd0df44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=axis+and+allies+iron+blitz+manual PDF link annotation
    • https://madeinstlucia.com/userfiles/files/5883575606.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f31a638968---rirovilanivomotugaritigu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/63242020973.pdfIn PDF document text
    • http://charontrade.hu/data/file/11706009947.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/3500778049.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/32367978857.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/95805479198.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/fegizexoxukategiw.pdfIn PDF document text
    • http://pbpharm.com/upload/files/92684399725.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/ratotagekunilidade.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/76408915721.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/6291271029.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/97291714339.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/7883077681.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l3er2a64etrl71vo8s9vvs5cdg/46177183265.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/gawewajofitivufif.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/galugiw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b71b0ec9---ludadolejakagimami.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/kosenibifaze.pdfIn PDF document text
    • http://emeat.ru/var/files/79824065012.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/17094152610.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/29497564466.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/61239524758.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/rivirujumanaradajuwiti.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/domonawugizupixosovazapu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 18280 bytes
SHA-256: 8a381eca3d38ef14cbe6ca45e15bf5c03e094c9481dafcc234f0d2ffde422636
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10792 bytes
SHA-256: 8a1dba9a4a9384841199cd8f46177eefa7905b44bda028f75d9508e369ac5038