Malicious PDF — malware analysis report

Static analysis result for SHA-256 8598b500c3248776…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 20:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b8fccce0e3d2fb0284aad43437bad60 SHA-1: e3d829f9ad6d2aedb9bae0b2b517221ebdecd068 SHA-256: 8598b500c324877638b3cc769952b14ab9356a54fd7ff7b980f296ee894705c7
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other potentially malicious URLs. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially compromised sites suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fvv-hohenfelde.de/sites/default/files/files/6016358843.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dac75e38e---67382651861.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9465619e---taxal.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395404406c3---sosodidedogik.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ce9648e2c1778f24e5fd6175a27b063/firunonoxup.pdf
    • https://art-lamps-rali.eu/files/file/pifozese.pdf
    • http://tbeaindia.com/userfiles/file/debizigagitaga.pdf
    • https://softnettechno.com/sribati/editor/uploadfiles/96379756698.pdf
    • http://rubella2.integra-sh.com/userfiles/file/77806742641.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/linevev.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/zenuvevulevosifimideli.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109130500441297.pdf
    • http://selidbe-beograd.info/files/gavupedagorijipunokafabug.pdf
    • http://yoron.net/up/files/44283536565.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/ludazazomukefoxotulexi.pdf
    • https://samsunyapi.com/userfiles/files/22641456109.pdf
    • http://abwingsmd.com/uploads/files/rupuginipona.pdf
    • http://santeh.md/img/files/womixameromorijalexoxuram.pdf
    • http://sahamit.net/userfiles/file/vefafisoku.pdf
    • https://mashtalkandil.com/userfiles/file/saluvopinafefamud.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/situteligutewuwabodipovu.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/01fb9311272eae7f22ad26802af8ba00/4785243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=backup+mi+phone+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 16792 bytes
font_01_sfnt_off0000c97f.bin
bbbbf67f7b963f48a3aadc1bd854e720923759397323a3a8dc0b7e1bb18c8043
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 16008 bytes
font_02_sfnt_off0000f21f.bin
d195076cd87afe32fcacbf38364900ba57104950cdd47715e144f515405affe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10568 bytes