Malicious PDF — malware analysis report

Static analysis result for SHA-256 135bd0608f0ade9f…

MALICIOUS

PDF

94.7 KB Created: 2021-07-13 21:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97a7181227fb487e8146fb8567b991d5 SHA-1: fe71008e272652e13961899b7cc61d829a874320 SHA-256: 135bd0608f0ade9f273a5cdc365ec89f9316d6736519f5e2f50d9950febcd1ff
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608520b885b7f---1843072701.pdf In PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a57f1d7c1---22744741807.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/604c2cf1ae9e465f348f4bb4dcc9be28/83568996518.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050118120273499.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/75120655055.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4a41da9d---xigizovolirija.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/50393002999.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/97287810150.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2378479e---74538352683.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d855e559af---28018123997.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ea382556aafc2bd249c1741483536226/50718749670.pdfIn PDF document text
    • https://peterdegendt.be/file/35171868802.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1d9279d9c9d5cc2bb5050b2d014b4e36/dikavi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7224e48d0---sojobojopimune.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4900bcc1---jakanewosefu.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/51668842870.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/gomevogomumarobad.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/dfb24d7ff81c9084b3ce432eebe95024/kofalavafipamumer.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rifivugagapuwo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa13f58ea7---14184019107.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nekeziz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fhf8qif71dqgocklnpls8g1mns/9642470619.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e98180b28e---49810987033.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cvr7au142grq6bcq3un8ioo8c7/28996930256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=license+plate+office+raleigh+ncPDF 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_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 17372 bytes
SHA-256: 355047b579fedc839b4e0a90d8b28a0f9331378f5625421bbd00bdc217784d06
font_01_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 10716 bytes
SHA-256: 39a515be84862a31d4de9d9bcb2b5d8f89abf02396b8e29deda7aa39cc3ac330
font_02_sfnt_off0001554c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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