Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb27043819c2e3f8…

MALICIOUS

PDF

93.4 KB Created: 2021-08-17 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d50ab75959deac1c19d2e880d02f0221 SHA-1: 9bf5381bf193432d805bb3eb64e317eb92a78698 SHA-256: fb27043819c2e3f830300431c5f6a65797ded8332e3aa9ba6eb0280694e2a5d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malware or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608325c1cb526---21024342245.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/fujememasokezomav.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/c0hirh9g3sqg70mupoq4loahl6/vodisiwulatebezatu.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/11502690837.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/64fdafcd974a88ebc773d9f8b753dcfe/pikofuj.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d239bb7152d2f061a143df4e1d3e00f6/kinozujolejapumo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bklpja8lm9i8pqv9fftvh2960e/5118641118.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gh42ib9i4jfgdh1sqamv7odim/genewujexiw.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3c9b0193ffc80ff3a5f95a1157479386/23076021804.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tujafadufimizega.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/zowamoz.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/93602511386.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7737bc50cdfad3bc2b579cfda382876f/84297181333.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831998a7f88---medajo.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/velofajowizit.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/60821775228.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5204eb844e9cf0b680556cd0119f3753/sumixosefekobiwofil.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uegafg4710vhteqau4kvftjvgk/zekuxiradaxometexogowewo.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/475153355.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/492f82af7834450995e20425fd81bac2/88170961903.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/61657776329.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a51c192c6ec8b3999e45c07644300560/fevokomediwepafazox.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210816_4CF3DDC87C2229FC.pdfIn PDF document text
    • http://fitviewer.de/files/file/kipigozufane.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/52195874832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sweat+lynn+nottagePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 17276 bytes
SHA-256: 3108e1f436177e2a57544e054eaf6e3d695d8603c9db8595d29715a1815e1f73
font_01_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E54 10200 bytes
SHA-256: aeb098d63625b31341db5eeabae1882b54a79e814aa0f2405cfb2b5061ef2c4b