Malicious PDF — malware analysis report

Static analysis result for SHA-256 b736098d34da9d2e…

MALICIOUS

PDF

113.3 KB Created: 2021-07-02 19:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc87ec538f20b83fb43ab3911024b342 SHA-1: 319fbc2ba722af06c60b828f4638b4f89d6e390d SHA-256: b736098d34da9d2e11bc7bfa42e08290782a28d33480f25ff7ae6dec6aef9f87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39a46baf4---66709245593.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/42630690903.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/kesumowimuxamejipugosoxo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a60a47ce---watuzalenakujip.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/nigeluxikugavijaxorizewi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t9vgf43oli00pcebulaebuc2p3/25753518049.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d79db604---46287013178.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f62bed465---fonilosuzesokipamur.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ad7b1231---12396074957.pdfIn PDF document text
    • http://roocenter.ru/upload/file/81040788257.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jnnfju5sv2nr0ishta5ahhs5rs/85371823578.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/roledulen.pdfIn PDF document text
    • https://best-label.com/upload/files/23353265148.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9ad7db0a---pivokikutatirixifesoze.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c21f27bcb824ead66c69c0347046c509/76732346257.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sutirejinixivoxudiviz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ti34c4aoa8a1kbcge94limr80/vosesetepola.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105150214049466.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff5dbc2cf---68251783831.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c5ed3f38b---74323586984.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4c4576869466042a39807e16285ffa38/ravapagefugexo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3kjd3cn7bnkrfmo4phivufko33/43151466798.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///venusoluwokavobividif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=forego+meaning+in+tagalogPDF 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
stream_004_off00017212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17212 26972 bytes
SHA-256: 0f1003926b818479e0aa4ab29c0910dcf77df2d182fb884599af3ee77586a67a
font_00_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 18332 bytes
SHA-256: 9db68439a1de7dd8874ccc268a912000959d3968b1dc6a05a7163a14d593ee79
font_01_sfnt_off00015a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A074 10260 bytes
SHA-256: 173d68185459990d76f2523c20f875e87619c6c02080697509bd0b0e5baba594

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