Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d76d0be7f8dcb2…

MALICIOUS

PDF

77.5 KB Created: 2021-07-21 01:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25374c3542383cc46ac03b942f505072 SHA-1: 4028b4f9befbd4cbe7d841c685efed6d2833c9ad SHA-256: f9d76d0be7f8dcb2505bafedeb7a4c42e78784133fe0ec528f0a23fd468a680d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bnbthoqgq3ldbu8a9572eild33/26449803889.pdf In PDF document text
    • https://paklya.su/design/img/upload/file/kamaf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lowula.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/92893361943.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d9008e32d---23311358397.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d46873a7d---worepiwigotipim.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/34738452729.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/guvolonisuzezovudu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/15f4a4b7cc904611e4b72c663f693168/baxulajezifasifogo.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ec839cfc6d362c7043d62a978a38745b/25342631069.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d074e6966ae---xisegupuguralikefapeja.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/86603644666.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/33522420995.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359e770d6d---fuzototarewur.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609858db8dd1a---gabujixigubutoz.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/39523043427.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/25197788530.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63cfb07bb---94113847436.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/rutitijadekot.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b46da428---68482376674.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/55837754850.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/15486406146.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/83508137328.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700088112e5---40979495670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=street+fighter+swimsuit+special+collection+2020+pdfPDF 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_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 20400 bytes
SHA-256: 98186f862402f699ef5ef29e2bd9f30b8c14307b5ffafa312d8e4acc036a7285
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 11568 bytes
SHA-256: 46463bcb23020852e6f0341d371342c43ae1bd64ef8970f4f3ce9f5df5b2c7a6

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