Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e0e60e2c0913d4…

MALICIOUS

PDF

75.5 KB Created: 2021-05-25 20:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dcd06f1991d31846ddee19559e77274a SHA-1: 7f7b86ccdea3ba723f16097464f667759cd707aa SHA-256: d7e0e60e2c0913d4be3378beada2f0a4f60dffe30238af660f855becf67fccf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body's garbled content and metadata suggest it's not intended for human readability but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5c3b5ee3---xijutajalukaz.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf95df031---popurifi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zuvuxologa.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4dc9e942---zogutagijakiguxafuvomar.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23a917cfd---51655104100.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6vjj2mv34ksq23c5ppb237hnm5/93547080594.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160970cfa2a343---vuvukuk.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c69fdd81a732b695e4f4346f3a5dcee5/84907527826.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jhb7bvf8otufqerad36var2693/jetijuvodemijawururofob.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vtjntg1jv6ssgc2h8m3mgtd355/18591630107.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/15849231789.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/86covti00tfn4bhnhpu1obui80/kevelefenivuna.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6nojiir16q9fs24t1u9jf49s2l/nogosopefisutopabazajov.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wobofijotabepi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cb1e1e8ff15adf959134af7c9d9f1a46/gagujogufebebokuwitokafon.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09430fc67---43565605201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=monopoly+slots+free+coins+cheatPDF 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://scripts.sil.org/OFLIn 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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 5208 bytes
SHA-256: 1139dac8a999903bdc7b9133f258134b8bd46353f0305094aeefbb4b6a60d950
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 10900 bytes
SHA-256: c18f0cd3d876cb7e6f0ca8d58232320dfeda8f3ec279d87df4b3b3b96195ee81
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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