Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab61c9dca9f082e5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 21:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98b448967afa8fec5fee42e1d70e7dcc SHA-1: a1384a096e7da156f6126f8230bc532841fd35d7 SHA-256: ab61c9dca9f082e5f12e072811377077dd309e9550515ebf5e273d56d1f9e1a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The presence of these links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://warwick-ems.org/userfiles/file/33401751641.pdf In PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gojigajerolidopipejetasam.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/fekalosiwefulibobidezi.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zekilobufo.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/74972316744.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910004852.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gevirugil.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/zakusorefapiganatebuvak.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/67455706164.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/movamopelokuja.pdfIn PDF document text
    • http://kasargod.net/uploads/file/91791345175.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52914536621.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/vewefenab.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/naxekimezujewozopejuxag.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/48984874589.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f9a39ce---31939733552.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/54224151198.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/26118403690.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/fegekedimasatovonetob.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8f643d842466ce047b2ab8d80713196/33558762883.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/vogopanidot.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/82259114887.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/77333942562.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1dd0222e9016047d42278ba3ad93c9b9/60529865224.pdfIn PDF document text
    • https://glozor.com/userfiles/file/51568325202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=job+scheduler+in+android+examplePDF 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_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 11012 bytes
SHA-256: 3218174a96d6301707710fdc0143b8135b735bbc88118a519b8c7cfaa3470e9d
font_02_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 17004 bytes
SHA-256: 69f1c04015e39f40a9b9da15a19dcd12a77d4c5de094cf5eadbd81cb0bbeecf2

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