Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7364a2167143024…

MALICIOUS

PDF

76.0 KB Created: 2021-07-16 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9ddb7f16a9993be9c0ecd8af8db0912 SHA-1: 6f2ba6ee01abc2bcfc177a798105fc480eb1c2d9 SHA-256: a7364a2167143024af70d6d02cdac69c67f17417d1ab2951515ffda4325bb8ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm heuristics indicate the document's primary purpose is to redirect users to potentially compromised or malicious websites. The use of compromised WordPress upload directories and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4c6cb034a---gubogenulemixufedoz.pdf
    • https://davaocarrental.com/images/file/43227248831.pdf
    • https://subarini.ro/mm/file/22972352769.pdf
    • https://adasms.fr/userfiles/file/jebosizutojixuwu.pdf
    • https://hkbca.org/UploadFiles/file/20210629052804161.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/evpjge2h0598rdqosmvnc4c0p3/zewezubufotez.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/72r38k2sre5kgidh5ijclel9la/pegilavopegivilig.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/aad86350029acf330b9498758b8ea031/44460549512.pdf
    • http://loscogliodifavignana.it/userfiles/files/jawimegetulemofanev.pdf
    • http://netmutum.com/userfiles/file/63117135129.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26678a0d6---95285056701.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed7dd30a53aee8e82ce1161270bf9880/komexamajal.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41eab19132---78745673251.pdf
    • http://lucann.com/Upload/file/65280559435.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e50292cd13---fepoboxururefulixetugeru.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5imk0d1diurvuujssp1m7qrn6/74515515169.pdf
    • http://askort.pl/Upload/file/pitigigopipevifup.pdf
    • http://drentmedischadvies.nl/uploads/files/kudepeka.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/63156b595b643fe235e6dffd390d1716/bamedoj.pdf
    • http://aranykoronakft.hu/userfiles/file/gojosobokoxivosinanizof.pdf
    • http://deurenhanger.nl/userfiles/file/ribuwemuwuzitivobukowuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=colour+selection+tool+photoshop
    • 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_off0000c89c.bin
c89a164ab245bc2288eb821b161d8a3d11d1c61024397a2f45d39ebc455531ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 10440 bytes
font_01_sfnt_off0000e039.bin
1d06c60302bdc0d0a6b57c4296af4d54739be51f2e14336b55ebd4f5e41f0792
pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16496 bytes
font_02_sfnt_off00010af0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16792 bytes