Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fc1e58982be220…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 07:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88febd7e049332dfaa2a1282c73a5474 SHA-1: b1150955fc92237423ffb48bcd66c753970731d6 SHA-256: 84fc1e58982be2205bea93a6e439a937ed9bed78bb197f1505d88420122db00a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, often with UTM parameters suggesting a phishing or social engineering lure. The embedded URLs and link farm structure strongly suggest an attempt to trick users into downloading malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=hack+version+of+clash+royale+apk+download PDF link annotation
    • http://synhbio.com/upload/files/2993526967.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/moruwilalopov.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/19581012259.pdfIn PDF document text
    • http://kaies.net/upfiles/file/mebasudubibufofinoro.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/favomisogomuwebezopi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d28abeb---23846524913.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b133488b7---pazolugipisixa.pdfIn PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/15980119401.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/lonoxozipetosinosebetiliw.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/jirijovorewa.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37756477084.pdfIn PDF document text
    • https://soechi.com/userfiles/file/ratux.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80c017b37---kijanumudunu.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/gonelipoligipogakejo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/pemufobexenoge.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/masinesifukidokilovuz.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136187e8b031---97516026300.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/zezijuzeziraxas.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gokajujomarotexo.pdfIn PDF document text
    • 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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10968 bytes
SHA-256: c3803703e7c350534309a45d6eb604f3df9aa94b05c91765fd754b9d980b8954
font_01_sfnt_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 15924 bytes
SHA-256: 9eb4197f3c9186a799a6e2fd6642d4db212679a8f017199720a413681118033b