Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98e4ef4ebee816…

MALICIOUS

PDF

124.7 KB Created: 2021-09-17 15:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b7eced008325544aa8545b005c81a98 SHA-1: a6483022504b92f8b217b2fc83e5144a4cc6fc48 SHA-256: af98e4ef4ebee816c3d107f6f8c0be8691a278703590990941cddc053768a9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's a phishing or trojan attempt. It contains a link farm that points to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an effort to obscure the ultimate destination. The presence of multiple external URIs and a link farm heuristic strongly suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://parfumzone.ro/files/file/lorifaxuxoro.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c97ed4c1---89595821427.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wotijorixamufinixupe.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/50306304336.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/20081215960.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/96112068964.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mumuvewunujijulidafamob.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vavuzevusawujami.pdfIn PDF document text
    • http://cy2hand.com/userfiles/88136598955.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af4a72b03---64957168566.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/36076158313.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134f70a5b678---butedewa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc47bc3e59---74657818399.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/gulefapowodorapafonusu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/vakuz.pdfIn PDF document text
    • http://geasit.it/userfiles/files/61939857755.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477dc788f3---66730854941.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/37445555657.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8836d17f64624e2004b07fa4b562da7b/32161705353.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/pabejopijabazeworir.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911175853.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a433acfab87cade7353814add3bad947/wejasibupiw.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/29243785156.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/37876722793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=supersu+app+rooting+softwarePDF 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_off0001811f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811F 18968 bytes
SHA-256: 84a6be284c4eff2c176cf22c403c5f64cdc2ac077ea781c191a1dad2bc53b10a
font_01_sfnt_off0001b366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B366 10748 bytes
SHA-256: 7e064d25514bcbae8480bf6b3d566e1733b2da979a300899d3a4d5e1f9f39848
font_02_sfnt_off0001cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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