Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06b5105166eaff5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 23:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d757ec6305f5d12043de66372bbdeedf SHA-1: 9169da793511ed112a2c5cff21908ccf399ba6d3 SHA-256: c06b5105166eaff5befe9105910fa97c3e397b5d502b86b859d72dc0e6478adc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=simulador+de+android+para+pc+descargar PDF link annotation
    • http://receptlap.hu/files/zokigagogisexebepotumazi.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/42935674029.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf37748ac---32520845553.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/weloxizuni.pdfIn PDF document text
    • http://123dvere.sk/files/file/kozalefekoxidogikulidu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/obfo8bi14v3c5petf1020k8rl1/37302436638.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pusezenapuzox.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/70378424434.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/zododiguxof.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/36841907526.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/2433910616.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///buvowavulaget.pdfIn PDF document text
    • http://master-br.ru/img/file/48837070057.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/wutizonulof.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/3758410040.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/sujonada.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/11643896824.pdfIn PDF document text
    • https://kopari.hu/files/file/xifukibipewiz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4055f327---28395391688.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/gozime.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf149fad3---16823699515.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/zutudoxerasukijogipe.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/lulomujepid.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/kagetimoxa.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10932 bytes
SHA-256: f01400d4242d769340e18cf44fc4c1dcbfa6fbd691d3861a26e33c2eddbfb06a
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 21528 bytes
SHA-256: 3feda81575ff50a39e9eec25e8abea25a06eaf1032ba4be5cafb9e53230ec971